Unit 2: Seam Finishes

Reading the Raw Edge: Why Fabric Ravels and What to Do About It

A seam finish is not decoration. It is the difference between a dress that still fits together after forty washings and one that quietly comes apart from the inside out. Before you can choose a finish intelligently, you have to be able to look at a cut edge and predict what it will do.

What a Cut Edge Actually Is

A woven fabric is nothing but two sets of yarns crossing at right angles: warp yarns running the length of the piece, weft yarns running across it. Nothing glues them together. They stay put because friction and the over-under crossing hold them in place. When you cut across those yarns, you sever that grip at the edge. Every wash cycle, every rub of the seam allowance against a body, works another short yarn loose, and the edge creeps backward toward your stitching line. A 5/8 inch seam allowance can lose a quarter inch to raveling and still hold. Lose half an inch and the seam is living on borrowed time.

Knits behave differently. A knit is built from interlocking loops rather than crossing yarns, so it does not ravel in the same way. Cut a jersey and the edge curls but does not shed threads. What a knit will do is run, and more importantly it stretches. A seam finish that cannot stretch with the fabric will snap its own thread the first time someone pulls the garment over a shoulder.

The Ravel Test

Do this before you cut out a garment, not after. Take a scrap of your actual fabric, at least four inches square. Cut one edge cleanly with shears. Run your thumbnail along that edge a dozen times, the way a seam allowance rubs inside a sleeve. Then throw the scrap in with your next load of laundry, wash and dry it exactly as you intend to launder the finished garment, and look at it again.

Loosely woven linen, rayon challis, silk crepe, and most bottom-weight suiting will surrender a fringe of loose threads immediately. Tightly woven quilting cotton, poplin, and taffeta will fuzz slightly and stop. Denim frays steadily and forever. Wool coating sheds a soft halo that looks alarming but stabilizes. That one scrap tells you more about the finish you need than any pattern envelope will.

Matching the Finish to the Behavior

Fabrics that barely ravel, in garments that are dry cleaned or rarely washed, can take the fastest finish available. Fabrics that ravel steadily need thread wrapped physically around the edge. Fabrics that ravel and also show, such as an unlined jacket where the inside is visible every time the wearer moves, deserve a bound edge. Knits need something with give.

There is one more variable that matters as much as fiber: how often the garment will be laundered. A wedding dress worn once and a child's everyday dress are not the same engineering problem, even in the same cloth. Ask how the garment will live before you decide how the seam will be finished.

Work That Is Never Seen

The whole subject sits inside a quiet truth. Nobody but you will ever look at the inside of that seam. It is hidden work, and hidden work is exactly where a craftsman's real character shows. Scripture speaks of those who "by reason of use have their senses exercised" — skill in discernment comes from practice, from having handled enough cloth to know what an edge will do before it does it. That is not a gift you are born with. It is built one scrap at a time.

Keep a labeled sample book. Staple or pin a finished sample of each fabric you sew, note the fiber, the finish you used, and how it looked after a year in service. Within a few projects you will stop guessing.

A Word on the Room

Pinking shears, rotary cutters, and machine needles are all genuinely sharp, and a sewing room shared with small children needs a habit, not a rule: blades go back in the drawer the moment you set them down, points covered. Nothing about seam finishing requires speed, and hurry is where fingers get cut.

Pinking Shears: The Fast Finish and Where It Honestly Belongs

Pinking shears cut a row of small triangles instead of a straight line. That saw-tooth edge is the oldest mechanical seam finish there is, it takes about eight seconds per seam allowance, and it is right far less often than most sewers assume. Learning where it belongs — and being honest about where it does not — is worth more than learning a dozen fancier finishes.

Why the Zigzag Cut Slows Raveling

Every yarn along a straight cut edge is equally free to work loose. A pinked edge cuts diagonally across the grain of both warp and weft, so a given yarn is anchored at the base of one triangle and cut short at the tip of the next. Short, angled cut lengths shed less readily than long, straight ones. Notice the verb: the pinked edge slows raveling. It does not stop it. Anyone who tells you a pinked edge is permanent has not washed one twenty times.

The second advantage is bulk, and it is the real reason couture workrooms still own a pair. A pinked edge adds nothing at all to the seam allowance — no thread, no fold, no second layer. Press a pinked seam open on crisp taffeta or a smooth cotton sateen and the right side shows no ridge whatsoever. Zigzag the same seam and you can often read the seam allowance from the outside as a faint line, because the thread coverage makes a step for the iron to print.

Where It Belongs, and Where It Does Not

Use pinking on firmly woven, crisp fabrics that ravel modestly: taffeta, poplin, quilting cotton, cotton sateen, many wools. Use it for garments that will be dry cleaned or worn rarely — a special occasion dress, a lined jacket where the seam allowance is protected inside, a muslin fitting garment you only need to survive a few tryings-on.

Do not use it on anything laundered weekly. Do not use it on chiffon, georgette, crepe, loose linen, or any fabric that fringed noticeably during your ravel test — the triangles simply become a row of little fringed points. Do not use it on knits, where the cut edge was never the problem. And do not use it inside a garment that gets hard wear at the seam, such as the inseam of work trousers, where the allowance rubs constantly.

Cutting Well

Sharp shears, one layer at a time, and let the blades close fully. Most failures come from trying to pink two or three layers at once. Thick fabric wedged between the teeth stops the blades from meeting, and you get a half-cut edge with skipped triangles that ravel faster than a straight cut would have.

Trim only about an eighth of an inch off the raw edge. You are shaping the edge, not re-cutting the garment, and every pass you take shortens the seam allowance you will need if the garment ever has to be let out. Work with long, deliberate closures rather than small nibbles, and start each new cut with the blades overlapping the last triangle you made — that keeps the row even and prevents the small straight notches that appear where two cuts meet.

Pinking shears are heavy and extremely sharp, and they stay sharp only if they cut cloth and nothing else. Paper, pins, and cardboard dull them in a single pass. Store them with the tips covered and well out of a child's reach.

The Refiner's Point

Proverbs describes taking away the dross so that a worthy vessel can come forth. Finishing an edge is the small version of that: cutting away the ragged, weak, unstable part so the sound work underneath can last. It is also a lesson in proportion. The dross is removed, not the silver. Trim an eighth of an inch, not half of your seam allowance, and be as careful about what you keep as about what you cut away.

If you are unsure whether pinking is enough for a particular cloth, pink one sample and zigzag another, wash them both three times, and let the fabric answer. That test costs one evening and settles the question permanently for that fabric.

Zigzag Settings by Fabric Weight: Getting Length and Width Right

Almost every household machine made in the last sixty years can zigzag, which makes it the most widely available real seam finish there is. It works by throwing the needle side to side as the feed dogs advance the cloth, so the thread crosses back and forth over the yarns at the edge and locks them down. Done at the right settings it is genuinely durable. Done at the default settings on the wrong cloth it puckers, tunnels, or fails outright.

The Working Starting Point

For a medium weight woven — quilting cotton, poplin, chambray, light twill — begin at 3.0 mm stitch length and 4.0 mm stitch width with a universal 80/12 needle and ordinary all purpose polyester thread. Stitch a test on a doubled scrap before you touch the garment. That combination puts enough thread across the edge to bind it without dragging the fabric into a rope.

Then adjust from that starting point in two directions. Heavier and more stable fabric tolerates a longer, wider stitch. Lighter and less stable fabric needs a shorter, narrower one. A loose weave that ravels badly needs the stitches closer together — shorten the length toward 2.0 mm — so more thread crosses each yarn.

On lightweight voile, batiste, or a soft rayon, drop to roughly 2.0 mm length and 2.5 mm width, and change to a 70/10 needle. The narrower swing keeps the machine from dragging the fine cloth sideways. On heavy canvas, denim, or wool coating, open up toward 4.0 mm length and 5.0 mm width with a 90/14 needle so the stitch clears the bulk instead of piling thread in one spot.

Where to Place the Stitch

You have two choices, and they solve different problems. Stitching so the right swing of the needle just clears the raw edge wraps thread around the fibers and gives the most protection — but on any fabric with drape it invites tunneling, where the unsupported edge draws up into a curled rope. The alternative is to stitch a scant 1/8 to 1/4 inch inside the raw edge, on supported fabric, and then trim close to the stitching afterward. That is the more reliable choice on lightweight and slippery goods.

What Goes Wrong

Puckering along the seam. The stitch is too dense or the tension too tight for the weight. Lengthen the stitch, loosen the upper tension slightly, and try again on a scrap.

Tunneling, the edge rolling into a cord. The stitch is too wide for an unsupported edge. Narrow the width, or move the stitching inside the edge and trim after.

Thread that skips or the edge that still ravels. The stitch length is too long for that cloth, or the needle is dull. A dull needle punches rather than pierces, and it will also make a ragged, whiskered edge on fine fabric. Change the needle after roughly eight hours of sewing, and always after hitting a pin.

The zigzag popping on a knit. A plain zigzag has more give than a straight stitch, but on a stretchy knit use a narrow, longer zigzag or a three step zigzag so the stitch can extend with the cloth.

Honest Measures

Proverbs speaks against divers weights and divers measures — the merchant who kept one set of weights for buying and a lighter set for selling. The principle behind it reaches into the workroom: measure the thing truthfully. Guessing "about a three" and reading the number on the dial are different acts. Write your settings down. When you find that 2.5 by 3.5 is exactly right for the shirting you buy every year, that record is worth more than remembering that it was "somewhere near three."

Practice Worth Doing

Cut nine scraps: three each of voile, medium cotton, and linen. Finish each set at 2.0 × 2.5, 3.0 × 4.0, and 4.0 × 5.0. Label every sample with the numbers in permanent marker, wash them all, and pin them into your sample book. You will never again have to guess at a zigzag setting for those three weights.

Overcasting Without a Serger: Three-Step Zigzag and the Overedge Foot

A plain zigzag is the foundation, but most machines built since the 1970s carry two more tools that finish an edge better and are almost never used. Both of them build directly on what you already know about stitch length and width, and neither requires buying a second machine.

The Three-Step Zigzag

Look on your stitch selector for a zigzag drawn as a stepped ladder rather than a smooth peak. Instead of a single needle swing from left to right, the three step zigzag takes three small straight stitches in each direction. That matters for two reasons. First, the thread is anchored at three points across the width instead of one, so the edge cannot draw up into a tunnel. Second, the stitch has real elasticity, which makes it the best machine finish available for knits when you have no serger.

Set it around 5.0 mm wide and 1.0 to 1.5 mm long — the length dial on this stitch controls the size of the little steps, so it reads much shorter than a plain zigzag. Use a ballpoint or jersey needle in 75/11 on knits, a universal 80/12 on wovens. Stitch about 1/4 inch inside the raw edge on flat, supported cloth, then trim close to the outer edge of the stitching with sharp shears. The result lies genuinely flat, which a plain wide zigzag on a loose edge rarely does.

The three step zigzag is also the right stitch for finishing the raw edge of a fraying rayon or a loosely woven linen, where a plain zigzag would eat the edge and still let threads escape.

The Overedge or Overcast Foot

This is a presser foot with a small metal pin or bar standing in the middle of the needle opening, sometimes with a wire guide along the right side. Paired with an overcast or overlock stitch pattern — usually drawn as a zigzag with a straight line along one side — it produces a machine version of a serged edge.

The pin is the whole point. The needle throws thread over that pin rather than over bare fabric, so the thread bridges the edge at a fixed width and cannot pull the fabric in. When the stitch clears the pin and the cloth advances, the thread loops sit slightly proud of the edge, exactly as they should. Run the raw edge against the wire guide and let the guide do the steering; your job is only to keep the fabric fed straight, not to aim.

Two cautions. Never use an overedge foot with a stitch wider than the foot allows — if the needle strikes the pin or the metal edge it will break, and a broken needle at speed can throw a fragment. Check your manual for the maximum width for that foot, and turn the handwheel by hand for the first few stitches of every setup to confirm the needle clears everything.

Fixing the Usual Problems

If the edge still tunnels, the needle is swinging past the pin instead of over it — your stitch width is too narrow for that foot. If the loops hang loose and floppy off the edge, tighten the upper tension a little at a time. If the fabric feeds unevenly and the edge wanders, the raw edge is not riding steadily against the guide; slow down and steer from a foot ahead rather than at the needle.

If the machine skips stitches on a knit, the needle is almost certainly wrong. A universal point will pierce a knit yarn instead of sliding between loops; a ballpoint solves it immediately.

Building on What Is Laid

Paul writes of laying a foundation and another building on it, and warns each builder to take heed how he builds. It is a good picture of skill. Somebody built your machine and put stitches in it that you never chose; somebody wrote the manual sitting in a drawer. Your work is to build carefully on what has been handed to you — to read the manual, learn which stitches you actually own, and use them well rather than reaching for the same two you learned first.

Spend one evening sewing a sample of every edge-finishing stitch your machine offers, on the same scrap, labeled. Most sewers discover at least one stitch they had never tried and then use for years.

Serger Fundamentals: Thread Paths, Loopers, and Three Versus Four Threads

A serger, called an overlock machine outside North America, does three things at once: it trims the raw edge with a moving blade, wraps thread around that freshly cut edge, and stitches a seam. It is the reason ready-to-wear interiors look the way they do. It is not a replacement for a sewing machine, and nobody needs one to sew well — but if you own one, understanding how the threads travel is the difference between a tool you trust and a tool that lives under a sheet.

The Thread Paths

A conventional serger carries three or four threads, and each one has its own tension dial because each does a different job.

Needles. These behave like the needle on any sewing machine: they carry thread down through the fabric to form the line of stitching that actually holds the seam. A four thread machine has a left needle and a right needle; a three thread stitch uses one of them.

The upper looper. A looper is not a needle. It carries thread across the top surface of the fabric, out past the trimmed edge, and back. It has an eye but no sharp point, because it never pierces the cloth.

The lower looper. It carries thread across the underside and out past the edge, and it interlocks with the upper looper thread at the outer edge of the stitch.

Where the upper and lower looper threads meet and lock is the visible outer edge of an overlock stitch. That meeting point is what you are watching whenever you adjust tension.

Three Thread Versus Four Thread

A three thread overlock uses one needle and both loopers. It wraps the edge fully and has good stretch, and it is the right choice for finishing seam allowances on lightweight and moderate wovens, and for edging knits that will not take heavy stress. What it does not have is a second line of needle stitching, so on its own it is not the strongest seam.

A four thread overlock uses both needles and both loopers. The second needle lays down a parallel row of stitching inside the first, which is what turns the stitch from an edge finish into a genuine seam. That is the stitch to use on a knit side seam, on activewear, and on stress areas in heavier goods like denim.

There is a practical middle path many sewers overlook: sew the seam itself on a conventional machine with a straight stitch, press it open, and then run each seam allowance through the serger separately as a pure edge finish. A pressed-open seam lies flatter than a serged-together seam and can be let out later. Serge the two allowances together only where you want the seam to stay narrow and flexible.

Blades and Safety

The moving blade sits just to the right of the needles and cuts continuously while the machine runs. Two habits keep it harmless. Never reach past the presser foot while the machine is under power, and never pull at jammed fabric without switching the machine off first. Feed pins nowhere near it — a pin under that blade can chip it or throw a fragment. Pull pins out well before the fabric reaches the foot, or pin parallel to the edge, far inside the cutting line.

You can disengage the blade on most machines when you want to overlock an edge without trimming it, which is useful when the seam allowance is already exactly the width you want.

Cunning Work

Exodus describes gold beaten into plates, cut into wires, and worked into blue and purple and scarlet and fine linen with cunning work — thread by thread, one strand at a time, into cloth. It is a striking picture for a machine that runs four separate strands along four separate paths and locks them into one edge. The work of the tabernacle was not casual; it was skilled labor done deliberately for God. Threading a serger correctly, in the right order, is the same kind of small faithfulness.

Thread in the order your manual gives. On many machines that is lower looper, upper looper, then needles, but the sequence is genuinely machine-specific and some common models want the upper looper first — your manual is the authority for yours. What is universal is this: a serger threaded out of order will not form a stitch, and no amount of tension adjustment will rescue it.

Balancing Serger Tension: Reading the Stitch and Correcting It

Most sergers that sit unused were abandoned over tension. The dials look like a puzzle, the stitch looks wrong, and the owner turns everything at once and makes it worse. The fix is not a magic set of numbers. It is learning to read the stitch, then moving one dial at a time.

What a Balanced Stitch Looks Like

Sew a sample on the fabric you actually intend to use, and lay it flat.

Turn it over and over. On a balanced three thread overlock, the upper looper thread should lie smoothly over the top surface and turn over the edge; the lower looper thread should lie smoothly over the underside and turn over the same edge; and the two should meet and lock exactly at the outer edge of the fabric — not on top, not underneath. The needle thread should sit flat in its line of stitching without pulling the fabric into a ridge and without leaving loose loops on the underside.

The edge itself should be full but not stiff, and the fabric under the stitching should lie as flat as it did before you sewed it.

Reading the Fault

Looper threads meeting on top of the fabric. The lower looper is being pulled over the edge, which means lower looper tension is too tight or upper looper tension too loose. Loosen the lower looper first, in small steps.

Looper threads meeting underneath. The opposite: upper looper too tight or lower looper too loose. Loosen the upper looper.

Loose loops standing off the edge, the whole stitch floppy. Both looper tensions are too loose. Tighten both a little.

The seam puckering or drawing up. Needle tension is too tight. Loosen it and check the stitch length; a very short length on lightweight cloth also gathers the edge.

A visible ladder of loose needle thread on the underside. Needle tension is too loose. Tighten it.

Change one dial by one number, sew four inches, and look again. If you have turned three dials and cannot say which one helped, you have learned nothing. Some sewers thread each path with a different color for a practice session — it makes every fault obvious at a glance and it is worth doing once a year.

Tension Follows the Fabric

Every change of fabric weight, thread type, or stitch type requires re-balancing. That is not a defect in the machine; it is how a serger works. Heavy fabric needs more thread to travel around a thicker edge, so effective tension rises even when the dial has not moved.

Stretchy knits are the common trouble. On many machines a knit that keeps popping its stitch is asking for a looser needle setting and a looper carrying more thread — a typical adjustment is raising the lower looper toward the upper end of its range while the needles and upper looper stay near the middle. Treat that as a direction to move, not as a recipe; dial numbering differs between machines, and your manual's chart is the authority for yours.

Thread matters as much as fabric. A fine, smooth serger thread and a heavier or fuzzier one will not balance at the same settings. Texturized nylon thread, sold for looper use, is soft and expands to fill an edge, which makes it pleasant on knits and swimwear — but it needs noticeably looser tension than ordinary thread. Change one variable at a time here too.

Before You Blame Tension

Rethread the machine. Fully, in order, with the presser foot raised so the tension discs are open. A thread that slipped out of a disc mimics a tension fault exactly, and rethreading fixes more serger problems than any dial ever has. Then check that the needles are seated all the way up, in the correct orientation, and are not bent or dull.

Iron Sharpening Iron

Proverbs pictures two blades brought against each other until both cut better. That is a fair description of balanced tension: four threads pulling against one another, no single one dominating, each holding the others in place. It is also a fair description of how sewing skill is actually learned. Very few people work this out alone from a manual. Find someone who has run a serger for years and sew beside her for an afternoon; take your samples to her rather than your questions. An hour of that is worth a month of guessing, and one day someone newer will bring her samples to you.

Cutting and Joining True Bias Binding

The two finest seam finishes in this unit — the Hong Kong finish and the fully bound seam — both depend on one homemade component. Package bias tape will do in a pinch, but it is usually stiff polyester-cotton in a limited range of colors, and it will not curve as sweetly or press as thin as a strip you cut yourself from good cloth. Cutting your own takes twenty minutes and changes the character of the finished garment.

Why the Bias

Spread a length of fabric out flat and find the two grain directions: lengthwise grain running parallel to the selvage, crosswise grain running from selvage to selvage. Pull on a strip cut along either one and it barely gives. Now pull on a strip cut at 45 degrees to both — the true bias — and it stretches noticeably and its width narrows as it does.

That stretch is the whole reason for cutting on the bias. Binding has to travel around the curve of an armscye or a neckline and lie flat on both the inside and outside of that curve, which requires the strip to be longer on one edge than the other. Only bias will do that. A crosswise strip forced around a curve will ripple on the outer edge and drag on the inner one.

A second benefit matters here: a bias-cut edge ravels very little, because no single yarn runs the length of the cut. That is precisely why the Hong Kong finish can leave one binding edge raw without regret.

Cutting Straight Strips

Press the fabric first. Fold one cut corner up so the crosswise cut edge lies exactly along the selvage — that fold is the true 45 degree bias. Press the fold lightly and cut along it. From that first bias edge, measure and mark parallel lines with a ruler and chalk, then cut.

Width depends on the job. For a Hong Kong finish, cut strips 1 to 1 1/2 inches wide. For a fully bound seam where both binding edges are turned under, cut wider — around 2 inches for a 1/2 inch finished width — because the two folds consume fabric.

A rotary cutter with a long acrylic ruler is faster and truer here than shears, since you are cutting many long parallel lines. Cut away from your body, close the blade guard every single time you set the cutter down, and never leave it live on a table where a child could reach it. Rotary blades cut skin more readily than they cut cloth.

Joining Strips

Bias strips are never long enough. Join them on the straight grain, not on the bias, so the seam does not stretch.

Lay two strips right sides together at right angles, so their ends cross and form a small square of overlap. Stitch diagonally across that square, corner to corner. Open the strips out and they form one continuous straight strip with a diagonal seam. Trim the seam allowance to 1/4 inch, press it open, and cut off the small triangles of fabric — the "ears" — that stick out past the strip edges. Press the whole strip flat.

The diagonal seam is not fussiness. A straight-across join puts all its bulk in one place across the width, and that lump will print through when the binding is pressed. A diagonal join spreads the same bulk over a longer distance and disappears.

Handling Without Stretching

Bias will grow if you let it. Do not hang cut strips over the edge of the table, do not iron them by shoving the iron along their length, and do not pull them through the machine. Press by lifting and setting the iron down, and feed the strip with light, even support at both sides of the needle. A strip stretched while sewing will pull the seam allowance it is bound to into a wave that no pressing will remove.

Spread Forth

Ezekiel's picture of fine linen with broidered work spread forth as a sail is one of Scripture's quiet acknowledgments that cloth is a serious material and that skilled textile work was worth writing down. There is a kind of pleasure in laying a good piece of fabric out flat on a clean table, squaring it, and cutting it well. Take the pleasure honestly; it is part of the work.

The Hong Kong Finish: A Bound Edge for an Unlined Garment

Open a well-made unlined jacket and look inside. If the seam allowances are each wrapped in a narrow band of contrasting silk or cotton, with no raw edge anywhere in view, that is a Hong Kong finish. It is slow, it is beautiful, and it is the correct answer for exactly one situation: a garment whose insides are seen, in a fabric that ravels, where you do not want the bulk of a fully enclosed binding.

What You Need First

Sew the seam and press it open. The Hong Kong finish is applied to each seam allowance separately, flat, after the seam exists. Cut bias strips 1 to 1 1/2 inches wide from something light — cotton lawn, batiste, china silk, or a lightweight lining fabric. Heavy binding on a heavy seam allowance produces a ridge that prints through to the right side, and the point of this finish is that it does not.

Use an 80/12 universal needle for cotton binding on wovens, and match your thread to the binding, not the garment, since some of it will show inside.

The Three Steps

First, stitch the binding on. Lay the bias strip right side down against the right side of one seam allowance, raw edges even, and stitch 1/4 inch from the edge. Sew only through the seam allowance — never catch the garment itself. Keep the bias under light, even tension; if you stretch it, the seam allowance will ripple permanently.

Second, wrap and press. Fold the bias over the raw edge of the seam allowance so it wraps around to the underside. Press with the tip of the iron, working along a short section at a time. The binding should hug the edge snugly. If it is loose, the wrap is too generous, and the stitching in step three will miss.

Third, stitch in the ditch. From the top side of the seam allowance, stitch directly in the groove where the binding meets the seam allowance — right in the well of that first seam. Done accurately, this row is invisible from the top, and on the underside it catches the wrapped binding and holds it down. Trim the raw underside edge of the binding to about 1/8 inch from that stitching.

That trimmed raw edge is left raw on purpose. Cut on the bias, it will not ravel meaningfully, and leaving it unturned is what keeps this finish thin. Repeat for the other seam allowance, and press the whole seam open one last time.

Where It Goes Wrong

The stitching wanders out of the ditch. Slow down and use a straight stitch of about 2.5 mm. A blind hem foot or an edge-joining foot with a center blade riding in the groove makes this dramatically easier — set the needle position so it falls just inside the well.

The underside stitching misses the binding entirely. Your wrap was too loose, or your first seam was wider than 1/4 inch. Check by folding the wrapped binding back before you sew: the underside layer should extend past the ditch by a comfortable margin.

The seam allowance has waves in it. The bias was stretched during application. There is no rescue except to pick it out and redo it with a lighter hand, so test on a scrap first and learn what "light tension" feels like.

A ridge shows on the right side. Your binding fabric is too heavy for the garment fabric. Change to something lighter and press over a seam roll rather than a flat board, which keeps the iron from printing the edge through.

Curiously Wrought

The psalmist says he was made in secret and curiously wrought — an old phrase meaning finely and skillfully made — in a place no eye could see. The bindings inside a jacket are the same sort of thing. No one will inspect them. No one will praise them. You will know they are there every time you put the garment on, and so will God, who sees the hidden work and made the first hidden work Himself. That is reason enough to do it well.

Allow real time. A Hong Kong finish on a jacket is an evening's work, not a fifteen minute job, and rushing it is how the ditch stitching wanders.

Fully Bound Seams: When to Enclose Both Edges Instead

A fully bound seam is the Hong Kong finish's sturdier relative. The difference is one fold. In a Hong Kong finish the underside edge of the binding stays raw; in a bound seam both edges of the binding are turned under, so the binding is finished on both faces and nothing raw exists anywhere in the seam. That single change costs bulk and time and buys durability and a tidier reverse.

Doing It

You can work from a folded strip or from flat bias.

With double-fold bias tape, whether purchased or made with a bias tape maker, the tape already has both long edges pressed under and a center fold. Slip it over the raw edge of a single seam allowance so one folded edge lies on top and the other underneath. The underside is deliberately made slightly wider — set the tape so the underneath fold extends a hair beyond the top one. Then edgestitch from the top, about 1/16 inch from the tape's folded edge, through all layers. Because the under layer sits farther in, that one row of stitching catches both sides. If you center the tape perfectly, the stitching will miss underneath about half the time.

From flat bias, stitch the strip to the seam allowance 1/4 inch from the edge exactly as for a Hong Kong finish, then turn the raw outer edge of the strip under before wrapping it around, and stitch in the ditch. It takes longer but lets you use any fabric you like.

Press as you go, using the tip of the iron and lifting rather than sliding. Bound seam allowances hold heat, especially with steam; give them a moment before you handle them.

Choosing Between the Two

Bound seams suit unlined coats and jackets in wool, heavier unlined garments that will be laundered rather than dry cleaned, and any place where the reverse of the seam is genuinely visible and gets handled. The enclosed edge stands up to rubbing that would eventually fuzz a raw bias edge.

The Hong Kong finish suits lighter unlined jackets, dresses, and any fabric where an extra fold of binding would show as a ridge on the outside. It is faster, and on fine cloth it is often the better-looking of the two precisely because it is thinner.

The honest way to decide is to make both. Take two identical scraps of your garment fabric, sew and press a seam in each, bind one each way, and set them side by side. Feel the thickness between your fingers, press each one, and hold them up to see whether either prints through. Note how long each took you. Fifteen minutes of that will settle the question for the specific fabric in front of you far better than any general rule.

Neither finish belongs on a garment that is fully lined. If the lining hides the seam, a zigzag or a serged edge does the same structural job for a fraction of the labor, and the binding is only weight.

Watching the Bulk

Bound seams stack layers fast. Where two bound seams cross — a side seam meeting a waist seam, an armhole meeting an underarm seam — you can end up with eight or ten layers under the needle. Two habits help. Grade the seam allowances before binding wherever a crossing is coming, and hand-walk the machine through the crossing point with the handwheel rather than driving through it, which is how needles break.

Glory and Beauty

Exodus says the priestly garments were made "for glory and for beauty." Not only for function, not only for covering, but for beauty — and God said so plainly to the people making them. That settles a question some careful Christians worry over. Taking trouble to make a garment lovely, inside and out, is not vanity. Vanity lives in the motive, not in the workmanship.

The same passage is a good place to think about what we are covering people with. Clothes that fit kindly, cover honestly, and are built to last are a real service to whoever wears them. A well-bound seam is a small piece of that service: the garment will still be sound in ten years, and the person wearing it will never have to think about it at all.

Matching the Finish to the Garment: A Working Decision Guide

You now have seven ways to finish an edge — pinking, plain zigzag, three step zigzag, overcasting with an overedge foot, a serged overlock, the Hong Kong finish, and a fully bound edge — and two ways to build a seam that needs no finish at all. What remains is judgment: standing at the cutting table with a length of cloth and a pattern, deciding in thirty seconds which finish this garment gets. Four questions settle it almost every time.

The Four Questions

How much does this fabric ravel? You know from your scrap test. Barely raveling and stable — pinking is honest. Steadily raveling — zigzag, three step zigzag, overlock, or binding. Badly raveling and fine — enclose it entirely.

How often will it be washed? Weekly laundry rules out pinking and argues for a thread-wrapped or enclosed edge. A dry cleaned garment can take the lightest finish that keeps the allowance intact.

Will anyone see the inside? An unlined jacket, a wrap dress, a cape — the reverse is public. Bind it. A fully lined garment hides everything; do the fast, strong thing and spend your hours where they show.

Is the fabric woven or knit? Knits need a finish with stretch: an overlock, a three step zigzag, or nothing at all, since a knit edge does not ravel and many knit garments are perfectly sound left raw inside.

Two Seams That Finish Themselves

Sometimes the best finish is a seam that never leaves a raw edge.

A French seam encloses the edges inside the seam itself. Sew the pieces wrong sides together at 3/8 inch, trim the allowance down to about 1/8 inch, press the seam open and then fold the pieces right sides together along the seam line, press again, and sew a second seam at 1/4 inch, which traps the trimmed edges inside. It suits sheers, silks, batiste, and lightweight cotton — the whole class of fabrics where a bulky finish would show through. It is not for curves that are sharply shaped, and not for heavy cloth.

A flat-felled seam is the workhorse: the seam on the outside of a pair of blue jeans. Sew the seam, press both allowances to one side, trim the under allowance to about 1/4 inch, fold the wider allowance over the trimmed one and under itself, then topstitch that fold flat through all layers. It gives two rows of visible stitching, no raw edges, and enormous strength. Use it on denim, canvas, twill work shirts, and anything that will be worn hard and washed hard. Use a 90/14 or 100/16 needle in heavy cloth and lengthen the stitch to about 3.0 mm.

The Quick Table

• Sheer or fine silk, seldom washed: French seam, or Hong Kong if unlined and visible
• Quilting cotton, lined garment: zigzag or three thread overlock
• Loose linen, everyday dress: three step zigzag or overlock, or French seam if light enough
• Denim or canvas work clothing: flat-felled, or four thread overlock plus topstitching
• Wool coating, unlined jacket: bound or Hong Kong finish
• Knit jersey: four thread overlock, or three step zigzag
• Taffeta, formal dress worn once: pinked

Whatsoever Ye Do

Paul's word covers eating and drinking, which is to say it covers the ordinary. Nothing is more ordinary than the inside of a seam. Doing that to the glory of God does not mean the most elaborate finish available every time — an evening spent binding the inside of a lined coat is an evening taken from something that needed it more. It means the right finish, done well, for the sake of the person who will wear the garment.

That person is worth thinking about. Clothing that is well made, that covers comfortably and honestly, that holds its shape after a year, is a genuine kindness — especially to a family sewing from necessity, where one dress must serve a long time. Modesty in dress is at heart the same kindness, offered outward: clothing chosen so that the person is seen rather than the body displayed. Good construction serves it quietly, because a garment that hangs properly and does not gape or come apart lets whoever wears it forget about it entirely and go do her work.

Sew a labeled sample of all seven finishes on one fabric this week. Keep them where you cut. The decision gets faster every time you make it.