Unit 7: Everyday Fabrics

Reading the Cloth on the Bolt

Denim, corduroy, flannel, fleece and canvas are the workhorses. Between them they clothe a family, cover a chair, carry the groceries and keep a child warm at the bus stop. They are also the fabrics most likely to humble a confident sewer, because each one asks for something different at the cutting table and at the machine. Before any of that, you need to be able to stand in front of a bolt and know what you are holding.

What they are made of

Four of the five are cotton. Denim is 100% cotton in a twill weave. Canvas is heavy cotton sold by weight. Corduroy is cotton with a cut pile standing up from the ground weave. Flannel is a medium-weight cotton brushed to raise a soft surface. Because they are cotton, all four drink water, take steam readily, and shrink when heat and moisture get into them.

Fleece is the odd one out. It is polyester — a synthetic — and it is knitted rather than woven. That single difference drives everything about how you cut it, what needle you put in the machine, and what thread you use. Polyester does not absorb water the way cotton does, and it will not answer to a hot iron the way cotton will.

Telling them apart by hand

Lay the cloth flat and look across it in raking light. Denim shows a fine diagonal rib running corner to corner; that is the twill line, and it is the surest identification there is. Corduroy shows raised vertical cords called wales, thin on pin wale goods and thick on wide wale. Stroke the surface with your palm in both directions along the selvage: one way is smooth, the other rough. That is nap, and corduroy has it strongly.

Flannel looks fuzzy on both faces and feels warm rather than crisp. Its nap is subtle but real, and it varies from bolt to bolt, so verify it with your own hand rather than assuming. Fleece stretches when you tug it crosswise and springs back, and a cut edge does not shed threads the way a cut woven edge does. Canvas is plain, dense and stiff enough to stand up a little on its own; hold it to a window and very little light comes through.

Weight, opacity, and clothing the body

Hold every dress-weight fabric up to the light before you buy it. What looks solid folded on a bolt can turn sheer over a lamp, and a garment that must be apologized for after it is finished is wasted cloth and wasted evenings. Scripture asks for modest apparel, and the plainest way to honor that is at the fabric store, not at the mirror. Choose cloth with enough body to hang away from the figure instead of clinging to it, and enough weight to be opaque in one layer. This is a kindness to the people you live among, and it is far easier to build in at the beginning than to patch in at the end.

Corduroy, flannel and mid-weight denim all do this well, which is one reason they have clothed working households for generations.

Matching cloth to the job

Denim and canvas belong on work clothes, aprons, tool rolls, totes and slipcovers — anywhere the fabric will be dragged, loaded and washed hard. Corduroy makes trousers, jumpers and jackets that wear warm in cold weather. Flannel makes shirts, nightclothes, linings and sheets. Fleece makes outer warmth quickly and cheaply, and it is forgiving of an imperfect fit.

Two things to settle before you buy

First, cotton needs preshrinking, and denim can surprise you badly if it was never preshrunk at the mill. Second, napped goods must be cut with every piece running the same direction, and corduroy must be cut in a single layer rather than folded double. Both facts mean you buy more yardage than the pattern envelope suggests. Decide that at the counter, not after the cloth is home and the pattern will not fit on it.

Why Denim Refuses to Tear: The Twill Weave Explained

Denim outlasts almost everything else in a working wardrobe, and the reason is structural rather than mysterious. It is ordinary cotton. What makes it strong is the way the yarns are crossed.

Over three, under one

In a plain weave, each crosswise yarn goes over one lengthwise yarn and under the next, all the way across — the pattern of a window screen. Denim is woven as a twill, most often a 3/1 twill: the warp yarn passes over three weft yarns, then under one, and the crossing point shifts by one yarn on every row. Those shifting crossings line up into the diagonal ribs you can see on the face of any pair of jeans.

That diagonal is not decoration. In a plain weave, a stress lands on one intersection and stays there until something gives. In a twill, the long floats let the yarns slide and settle a little, so the load spreads across many threads instead of pulling one. Solomon's line about a threefold cord holds true at the scale of a thread: strength comes from things bound together in company, not from any single strand being heroic.

Face, back, and the direction of the line

Look at both sides of a piece of denim. The face is dark, because in a 3/1 twill the indigo-dyed warp is on top three times out of four. The back is pale, because the undyed weft dominates there. That is why worn jeans fade the way they do — abrasion wears the color off the crowns of the warp yarns and lets the white core show.

Hold the fabric with the selvage running up and down and note which way the diagonal leans. Cut every piece of a garment with the twill running the same direction, exactly as you would with a nap. Two panels cut with opposing twill lines will not look wrong to a stranger, but they will catch the light differently and they will settle differently after a few washings.

Weight, and what it demands of the machine

Denim is sold in a wide range of weights, from light shirting through midweight jeans cloth to the heavy stuff used for work trousers and chore coats. The heavier it is, the more resistance the needle meets. Denim takes a universal needle in size 14/90 for lighter goods and 16/100 or 18/110 as the cloth gets heavy. A jeans needle in those same sizes is better still: it has a reinforced shaft, so it resists deflecting sideways when it meets a dense spot, and a point shaped to push between the packed yarns rather than shove them.

Deflection is the thing to understand. A slender needle entering dense twill can bend a few thousandths of an inch off course, strike the edge of the needle plate or the hook, and snap. What you feel first is usually a change in sound — a knocking or a dull thud instead of a clean stitch — and skipped stitches on the underside.

When something goes wrong

If the needle begins knocking or breaks, stop. Do not push harder or pull the fabric through; hand-feeding heavy cloth past the feed dogs is the fastest way to bend a needle into the hook. Put in a fresh needle one size larger, check that the upper tension is set for the weight you are sewing, and slow the machine down. Steady, deliberate speed drives a needle through dense twill far better than a fast run at it.

If the fabric puckers along a seam instead of lying flat, the tension is usually too tight for the weight; ease the upper tension slightly and sew a test seam on scraps of the same cloth, folded to the same number of layers you will meet in the real work.

A test worth doing

Cut two four-inch strips of denim, sew a seam in each with a different needle size, then pull the seams apart with your hands. You will feel the difference between a stitch line that was formed cleanly and one that was fought for.

Sanforized or Raw: Preshrinking Before the Scissors Touch

No alteration on earth fixes a garment that shrank after it was finished. Preshrinking is the cheapest insurance in sewing, and with denim and flannel it is not optional.

Sanforized and unsanforized

Most cotton yardage sold at retail has been sanforized: mechanically preshrunk at the mill with steam, heat and compression, so that the cloth has already given up most of what it was going to give. Sanforized denim will typically move only about one to three percent when you wash it the first time. Unsanforized denim — sold as raw or shrink-to-fit — skipped that step, and it can pull in seven to ten percent the first time water touches it. On a thirty-inch inseam that is a difference of two inches or more.

These figures are typical, not a promise. Shrinkage varies with weight, dye process and mill, so treat them as a warning about the size of the risk rather than a number to calculate with. The one certainty is that raw denim moves several times as much as sanforized denim, and that vintage and imported goods are the likeliest place to meet it unlabeled.

Flannel is its own case. It commonly shrinks up to about three percent, and — this is the part that catches people — it keeps giving up a little more after the first preshrinking. A hot wash and a high-heat dry will take out roughly one to one and a half percent of that. Plan for a second washing to move it again, and build a little ease into anything fitted.

Doing it properly

Treat the yardage exactly the way you intend to treat the finished item, only harder. If the garment will be washed hot and tumbled dry, preshrink hot and tumble dry. Wash denim and flannel separately from other laundry; both shed heavily, and flannel in particular fills a washer with loose threads and a dryer with lint.

Clean the dryer's lint trap completely before you start and again when you finish. A trap packed with cotton lint slows drying and is a genuine fire risk, and preshrinking a few yards of flannel will fill one faster than you expect.

Before washing, finish the raw crosswise ends of the yardage — a zigzag, an overcast stitch, or pinking — or you will pull a fist-sized snarl of threads out of the machine and lose several inches of usable cloth.

Measuring what actually happened

Guessing is not knowledge. Cut a square from your yardage, ten inches by ten inches, and mark the exact measurement along both the lengthwise and crosswise grain with a permanent marker before it goes anywhere near water. Wash and dry it with the rest of the piece, then measure again. If it comes back at nine and a half inches lengthwise, the cloth shrank five percent in length, and you now know what you are working with instead of hoping.

Do this before you buy for a fitted project when you suspect raw denim. Whatsoever thy hand findeth to do, do it with thy might, Ecclesiastes says — and cutting a test square and actually measuring it, rather than eyeballing a bolt and hoping, is what doing this particular task with your whole strength looks like. Half-effort here is not a shortcut; it is skipping the one step that tells you the truth. An hour and a test square spent before the scissors is worth more than a week of finished work thrown away because the shortcut was taken instead.

Pressing dry, and cutting

Let cotton dry fully before cutting. Damp cloth relaxes and stretches under a rotary cutter, and the pieces will not stay the size you cut them. Press the yardage smooth with steam, working with the grain rather than shoving the iron diagonally, and let it cool flat on the table before you lay a pattern on it. Cloth that is pressed and then immediately folded up warm will set creases you fight later.

Keep the iron flat on its heel when you turn to reach for pins, and keep the cord clear of the table edge — a hot iron pulled off a cutting table by its cord is the most common serious injury in a home sewing room.

Matching the Needle to the Cloth

More home sewing goes wrong at the needle than anywhere else. The machine is blamed, the thread is blamed, the fabric is blamed — and the trouble is a fifty-cent piece of steel that is the wrong shape, the wrong size, or simply worn out. The Preacher's line about the blunt iron is the whole of it: the man who will not stop and sharpen must put to more strength, and wisdom saves the strength.

Reading the numbers

Machine needles carry two numbers, European and American, printed together: 80/12, 90/14, 100/16, 110/18. The first number is the European size, the second the American; they mean the same needle. Larger numbers are thicker needles for heavier cloth. Once you know that, a whole shelf of packets becomes readable.

Size is only half of it. The other half is point shape, and that follows the fiber and the structure of the fabric.

Three points, three jobs

A universal needle has a slightly rounded point that works on most wovens. It is the right choice for denim, flannel and canvas.

A jeans needle has the same general point but a reinforced shaft and a modified scarf, built so the needle will not deflect sideways when it enters dense cloth. Denim and canvas both accept jeans and topstitching needles for this reason.

A ballpoint or stretch needle has a distinctly rounded tip that slides between the loops of a knit rather than piercing them. Fleece requires this. A pointed needle in fleece splits the fibers of the loops and starts a run — a vertical pulled line called laddering — that spreads with wear and destroys the seam from the inside.

Sizes for these five fabrics

Flannel takes a universal needle anywhere from 80/12 up to 110/18, and 80/12 handles ordinary shirting flannel well.

Denim takes a universal or jeans needle from 14/90 through 18/110, chosen by weight. Light denim sews at 14/90; heavy denim wants 16/100 or 18/110.

Canvas takes a universal or jeans needle from 90/14 to 110/18, with 16/100 the usual working choice.

Fleece takes a ballpoint or stretch needle in 80/12 to 90/14 — a moderate size, because the fabric is bulky but soft and does not need brute force.

Corduroy is a cotton woven and sews on a universal needle sized to its weight, the way you would size for denim of the same heft.

When the needle tells you something

A needle that breaks is reporting a fact, and the fact is rarely "I was too small." Ask three questions in order. Were you pulling or pushing the fabric while the feed dogs were also moving it? Hand-feeding heavy cloth drags the needle sideways into the plate or hook. Was the needle sized for the layers at the thickest point rather than the average? A seam crossing three layers of denim is a different job from a single layer. Was the needle already dull or bent from an earlier session? A needle that has struck a pin once is done.

Change the needle far more often than feels necessary. A dull tip shows itself as skipped stitches, a popping sound with each penetration, and small pulled threads at the stitch line. Put a fresh needle in at the start of any project on heavy cloth, and again if you have sewn several hours.

Keep the machine unplugged, or at least keep your foot well away from the pedal, while you change a needle and while you clean around the feed dogs. It takes one distracted second for a running machine to drive a needle through a fingertip, and the household with children in and out of the sewing room should keep needles, spares and broken halves in a closed tin rather than a dish on the table.

A test to settle it

Cut four scraps — denim, corduroy, flannel and fleece — and sew a four-inch straight seam in each with the needle named above. Then sew each again with a plain sharp universal 80/12. Look at the fleece samples in particular, and stretch both seams. One holds. The other shows small ladders where the point went through the loops instead of around them. That is the whole argument for keeping four kinds of needles in the drawer.

Sewing Denim That Will Outlast the Wearer

Denim is honest cloth. It was made for people who work, and it rewards a sewer who slows down and thinks about bulk. Almost every failure at the machine on denim comes down to one of two things: too many layers arriving at once, or too much haste.

Set the machine before you set the fabric

Put in a fresh jeans needle sized to the weight in your hands — 14/90 for light denim, 16/100 or 18/110 for heavy. Sew a test seam on scraps folded to the same number of layers as the real work. A test on a single layer proves nothing about a seam that will cross four.

Watch two things on that test. The stitch should sit down into the cloth without pulling it into little waves; if the seam ripples, the upper tension is too tight for the weight, so ease it a little and try again. And the underside should show a clean line of loops, not gaps. Gaps mean skipped stitches, which on denim usually means the needle is too fine or already dull.

The problem is bulk, not strength

Where a hem crosses a side seam you can have six or eight layers stacked, and the presser foot tips up over that hill, lifts its toe off the cloth, and stops feeding. The needle then punches in the same place several times and breaks or bends.

Two habits fix this. First, reduce the bulk before you get there: press seam allowances open or to one side, and trim away what will be hidden, so the crossing has fewer layers to begin with. Second, level the foot. Fold a scrap of denim to the same thickness as the hump, tuck it under the back of the presser foot so the foot sits level, and walk the machine across the thick spot with the handwheel rather than the pedal. Turning the wheel by hand gives you complete control over a needle that would otherwise be driven blind.

Never pull the cloth through to help the machine. The feed dogs and the needle are working together on a timing you cannot improve by hand, and pulling is what bends needles into the hook.

Pressing is half of it

Denim takes heat and steam from either side without harm, which makes it forgiving compared with pile fabrics. Use that. Press every seam as you sew it — first flat as it was stitched, to set the stitches into the cloth, then open or to one side. A denim seam that has never been pressed will never lie down, and no amount of topstitching afterward will convince it to.

Keep a firm surface underneath. A padded ironing board absorbs the pressure you are trying to apply; a hard pressing surface returns it. Set the iron on its heel every time you let go of it, and keep the cord clear of the table edge.

What denim is for

The world dresses down and calls it leisure; a household that sews denim is usually doing something else. This is cloth for chore coats, work aprons, knee patches and trousers that will meet a fence line and a hayfield. Paul told the Thessalonians plainly that the one unwilling to work should not eat, and that plainness sits well with this fabric. When you sew denim you are outfitting somebody for labor, and the honor of the work belongs to the wearer and to the sewer alike.

Sew it strong. Where a garment will take real strain — the top of a pocket, the base of a fly, the corner of a patch — stop, reverse a few stitches, and go forward again, so the beginning and end of that seam are locked.

When something goes wrong mid-seam

If the needle begins to knock, stop immediately. Raise the foot, check that the needle is straight by eye, look underneath for a nest of thread in the bobbin area, and clear it before you go on. If a needle has broken, find both halves before you continue; a piece of broken needle left in the machine bed or on the floor is a hazard for hands and for bare feet, and doubly so where children come and go.

Finding the Nap: Cutting Corduroy So Every Piece Matches

Corduroy is cotton with a cut pile standing up from the ground weave in vertical ribs called wales. Pin wale is fine, wide wale is thick, and every version behaves the same way at the cutting table: it has a direction, and it will not forgive you for ignoring it.

Feel the direction before you trust your eyes

Lay the yardage flat with the selvages running away from you. Stroke your palm along the length of the cloth, first toward yourself and then away. One direction feels smooth, because your hand is lying the pile down along its natural lean. The other feels rough, because you are pushing the pile up against itself. That difference is the nap.

Now look at the same two directions in good light. With the pile leaning away from you, the surface reflects more light and the color reads lighter. With the pile standing toward you, light is trapped between the fibers and the color reads darker and richer. Both are correct choices for a garment; what is not correct is having both in the same garment.

Mark the direction the moment you find it. Draw arrows on the wrong side with tailor's chalk, every eighteen inches or so along the whole length, all pointing the same way. Once the cloth is cut into pieces and scattered on the table, nothing about a sleeve tells you which end was up.

Cut single layer, always

Ordinary yardage is folded selvage to selvage and cut two pieces at a time. Do not do that with corduroy. The pile on the two faces grips the pile on the other layer, the layers slide against each other as the shears or the rotary cutter travels, and the two pieces come out different sizes and slightly off from the pattern line.

Cut single layer instead. Open the yardage full width, right side up or down as you prefer, and lay out every pattern piece with its grainline parallel to the selvage and its nap arrow pointing the way you decided. For pieces that must be cut twice, flip the pattern piece over for the second cut so you get a left and a right rather than two lefts. That is the one thing single-layer cutting makes easy to forget.

Because all pieces must run one direction, a corduroy layout uses more yardage than the pattern envelope's plain-fabric figure. Buy accordingly.

What a nap mistake looks like

A garment cut with one sleeve running up and the other running down is not subtly wrong. In a lit room the two sleeves read as two different shades of the same color, and people notice without being able to say why. The same thing happens to a bodice front sewn to a back that runs the other way, or to a pocket applied upside down. There is no fixing it after the fact; the cloth is cut.

If you want to see it plainly before you risk a garment, sew two small rectangles together with the naps running the same way, then sew a second pair with the naps opposed. Stand both under a lamp. The lesson takes ten minutes and you will never lose it.

Handling on the table

Weight the pattern pieces down or use fine pins in the seam allowance; corduroy shows pin holes less than a smooth cloth would, but the seam allowance is still the safer place. A rotary cutter goes through corduroy cleanly on a mat, and it is the safer tool here than shears because it does not lift the cloth as it cuts. Close the blade guard every single time you set it down. An open rotary blade lying on a cutting table is the sharpest thing in the house, and it does not look dangerous, which is precisely the problem.

Corduroy sheds a fine cotton fluff as it is cut. Sweep the table and the floor before the pieces are laid out for sewing, and keep the shedding off the machine.

Order first, then speed. Paul's word to the Corinthians — that all things be done decently and in order — describes a cutting table as well as it describes a congregation.

Stitching Corduroy Without the Layers Creeping

Corduroy is cut and pinned and looks perfect. Then the first long seam comes off the machine with the top layer an inch shorter than the bottom, and the whole side is wavy. That is creeping, and it is the single most common corduroy failure.

Why the layers slide

Two pieces of corduroy laid face to face are two brushes pressed together. The pile of the upper layer catches in the pile of the lower layer, and the two surfaces do not want to travel at the same rate. Meanwhile the feed dogs are gripping and advancing only the bottom layer, while the presser foot is holding the top layer still. Over a twenty-inch seam that small, steady difference adds up to a visible mismatch and a wave that pressing cannot remove.

Amos asked whether two can walk together unless they be agreed. Two layers of pile cannot, and the sewer's whole job here is to bring them into agreement.

The walking foot

A walking foot is a presser foot with its own feed mechanism, driven off the needle bar, that grips the top layer and advances it in step with the feed dogs beneath. On corduroy it is not a luxury; it is the difference between a straight seam and a ruined panel. Fit it before you start, and check that its arm sits over the needle clamp so it actually cycles.

If you have no walking foot, you can get closer with several habits together: pin at right angles to the seam every two inches rather than every six, baste the long seams by hand first, hold the layers with light even tension in front of and behind the foot without pulling, and reduce the presser foot pressure if your machine allows it. This is second best and it is slower, but it works.

Direction and stitch settings

Stitch in the nap direction — that is, with the pile leaning the way the seam travels — rather than against it. Sewing against the nap pushes the pile up under the foot and makes the creeping worse.

Set the stitch length between 3.0 and 4.0 mm. Corduroy is a thick, lofty fabric, and the shorter stitches used on quilting cotton crowd the pile and pucker the seam.

There is one exception worth knowing. At the very beginning and the very end of a seam, drop to a very short stitch — around twenty stitches to the inch — for the first and last half inch. Those tiny stitches lock the seam without the lump that backstitching leaves in a pile fabric, so the seam ends can be pressed genuinely flat.

Pressing without crushing

Everything about pressing corduroy is about protecting the pile. A hot iron set flat on the face of corduroy flattens the wales into shiny tracks that will not come back.

Press from the wrong side, with steam. Lay the piece pile-down on a folded thick towel or a needle board if you own one, so the pile has somewhere to sink into, and press the seam allowance from the back. Use the weight of the iron lightly and let the steam do the work rather than leaning on it. If the pile does get flattened somewhere, hold a steaming iron just above the surface without touching it and brush the wales up with a soft brush; sometimes it recovers.

Take the same care with children in the room. Steam scalds instantly, and it travels sideways out of the soleplate where a small hand may be.

When the seam still wandered

Unpick it. A seam sewn at 3.0 to 4.0 mm comes out reasonably, which is one more argument for the longer stitch. Work with a seam ripper from the underside, cutting every third or fourth stitch and then pulling the top thread, and brush the shed pile off the fabric before you re-pin.

Then test on scraps before you commit again. Sew two six-inch strips with the walking foot and mark the top layer's starting and ending points against the bottom. If the ends still line up when you finish, the machine and the fabric are agreed and you can go on with confidence.

Flannel: Warmth, Lint, and Seams That Hold

Flannel is medium-weight cotton that has been brushed to raise a soft surface, and that raised surface is the whole story. It traps air, which is why flannel is warm. It is made of loosened fiber ends, which is why flannel sheds. And the brushing loosens the weave, which is why flannel ravels more than almost anything else you will sew.

The woman of Proverbs 31 is not afraid of the snow for her household, because her household is clothed. Flannel shirts, nightclothes and sheets are the plain modern form of that same provision, and they are within the reach of any sewer with an evening and a few yards.

Prepare it, and prepare for it to move again

Flannel commonly shrinks up to about three percent. Wash it hot and dry it hot before cutting; that removes something in the neighborhood of one to one and a half percent. What surprises people is that flannel keeps giving a little more up after that first treatment, so a shirt cut to exact measurements can still tighten across the back after two or three launderings. Cut with a little ease rather than trusting a preshrink to have finished the job.

Wash it alone. Flannel loads a washer with loose threads and a dryer with lint, and mixing it with other laundry moves that lint into everything you own. Empty the dryer's lint trap before and after; a packed trap is a fire risk and a slow dryer.

At the machine

Use a universal needle. Sizes from 80/12 up to 110/18 will handle flannel depending on its weight, and 80/12 is right for ordinary shirting. Flannel has a subtle nap, and whether a given bolt has a consistent direction is not something to assume — check it with your hand and your eye on the actual cloth in front of you, and if you can see or feel a difference, lay all the pieces one way.

Flannel is soft and slightly spongy, which means it can stretch under the presser foot on long seams. Pin more often than you would on quilting cotton and let the machine feed the cloth rather than helping it along.

Raveling and seam finishes

A raw flannel edge does not hold together for long. A garment finished with unfinished seam allowances will lose half an inch off each allowance in a season of washing, and eventually the seam itself opens. Finish every allowance one way or another.

The choices, from quickest to strongest: a zigzag along the raw edge; an overcast or three-step zigzag if your machine has it; a serged edge if you own a serger; a French seam on lightweight flannel where both allowances are enclosed; and a flat-fell seam, which encloses the edge and adds a second line of stitching, on shirts and anything that will be washed hard. A flat-fell also lies smooth against the skin, which matters for nightclothes.

Pinking alone is not enough for flannel. It slows raveling on tight weaves and barely slows it here.

Lint and the machine

Every hour of flannel sewing packs cotton fluff into the bobbin case, under the throat plate and down in the feed dogs. Left there, it absorbs oil, forms a felt, and eventually causes skipped stitches, thread nests and jams that look like tension problems.

Clean at the end of every flannel session, not once a season. Unplug the machine. Remove the throat plate and the bobbin case according to your manual, and lift the packed lint out with a stiff brush or a pair of tweezers. Do not blow into the machine with your breath or with canned air; that drives the fluff deeper into the works and can push moisture in with it. Vacuum it away if you have a small attachment, brush it away if you do not.

Change the needle more often than usual as well. Lint dulls nothing, but the long seams of a flannel project quietly use up a needle, and a dull point on soft brushed cotton shows as pulled threads along the stitch line.

Fleece Without Runs: Sewing a Fabric That Stretches

Fleece is the only synthetic in this group. It is polyester, and it is knitted rather than woven, which means it stretches, it does not ravel at a cut edge, and it will not tolerate the tools that serve cotton so well. Sew fleece the way you sew denim and you will produce seams that skip, ladder and pop.

It is also the fastest warm thing a person can make. A fleece cowl or a child's vest is an evening's work. Job, listing the mercies he showed the poor, names one of the plainest: a man's loins warmed with the fleece of his sheep. The word survives the centuries better than most sewing terms do — real sheep's fleece was the original quick, warm covering, spun and worked by hand into something a cold body could be grateful for. The knitted polyester in your sewing pile borrowed the name honestly. It is not wool, but it does the same simple job the same simple way: fast, warm, and given without ceremony to whoever needs it.

The needle is not optional

Use a ballpoint or stretch needle, size 80/12 to 90/14. The rounded tip slides between the loops of the knit and pushes them aside.

A sharp, pointed needle does the opposite: it pierces the loop itself and severs the yarn. The cut loop then lets go under stress and the break travels — a vertical pulled line called laddering, running away from the stitching like a run in a stocking. It usually appears after the garment has been worn a few times, which is the worst moment to discover it. Once a ladder has started there is no repair that restores the knit.

If you are seeing skipped stitches in fleece, the needle is the first suspect, and the second is a needle that is simply worn out.

Thread and stitch

Use polyester thread top and bobbin. Polyester has a little give in it, and that give is what lets a seam move with a stretching fabric. Cotton thread has almost none: the fabric stretches, the thread does not, and the thread is the thing that breaks. A seam that pops open across a shoulder or a cuff after a month is almost always cotton thread in a knit.

Set the stitch length long — 3 to 4 mm, or roughly eight to ten stitches to the inch. Short stitches crowd the loft of the fleece and pucker the seam, and they are miserable to unpick. Anything under 2.5 mm is asking for trouble on this fabric.

Where a seam must move with the body — cuffs, necklines, shoulder seams, anywhere that gets pulled over a head or stretched by an arm — do not use a plain straight stitch. Use a narrow zigzag, or a stretch stitch if your machine offers one. A zigzag has slack built into its path, so it can extend with the fabric instead of snapping. A straight stitch in a stretched knit is a row of small threads waiting to break one by one.

Cutting and handling

Fleece has a direction of greater stretch, usually across the width; find it by pulling gently both ways and lay the pieces so the stretch runs around the body, not up and down it.

Cut edges do not ravel, so seam finishing is optional and hems can often be left raw or simply turned once and topstitched with a zigzag. This is one of the real conveniences of the fabric.

Cutting fleece throws off a fine synthetic dust that irritates eyes and lungs. Cut in a ventilated room, and if you are cutting a large amount at one sitting, a dust mask is reasonable. The same fluff builds up in the machine as cotton lint does, so clean the bobbin area when you finish.

Keep the iron away from it. Polyester melts under a hot soleplate, and the damage is instant and permanent — a glazed, hard patch that no pressing will lift. If a fleece seam needs settling, finger-press it, or use a cool iron over a press cloth after testing on a scrap first.

A test worth ten minutes

Sew two fleece samples: one with a straight stitch, one with a narrow zigzag, both with polyester thread and a ballpoint needle. Pull each seam hard along its length. The straight-stitched sample will show the thread going taut and beginning to strain; the zigzagged one will simply extend and recover. That is the whole case for the zigzag, felt in the hands rather than argued on paper.

Canvas by the Ounce: Choosing Weight and Building Something That Lasts

Canvas is heavy cotton, and unlike the other fabrics in this group it is sold by weight rather than by feel. Learn the numbers and you can order it confidently by mail without ever touching the bolt.

Ounces per square yard, and the duck numbers

Canvas weight is given in ounces per square yard: the weight of one square yard of the goods. Higher numbers mean denser, heavier cloth.

Alongside that there is the numbered duck grading system, and it runs backward from what anyone expects. Number 1 is the heaviest at about 30 ounces per square yard, and number 12 is the lightest at about 11.5. In between, number 4 is roughly 24 ounces and number 10 about 15. Read the grade number as a position in a list running from heaviest to lightest, and it stops being confusing.

The numbered ducks are double-fill goods: the crosswise threads are doubled, which makes the cloth stiff and extremely durable — the stuff of tarps, work aprons and heavy bags. Single-fill duck, with single crosswise threads, runs about 7 to 12 ounces per square yard and is far more flexible. Single-fill is what you want for a tote that must fold, a light apron or a garment. Double-fill is what you want for something that should hold its shape when empty.

Choosing for a project

Match stiffness to function. A drawstring bag or a market tote works well in a mid-range weight such as number 10, around 15 ounces: heavy enough to stand up to loading, light enough to turn a corner under the presser foot. A tool roll or a floor cloth wants the heavy end. Anything that must drape wants single-fill, or a different fabric altogether.

Preshrink it. Canvas is cotton and it shrinks, and a bag that shrinks unevenly after its first washing will never sit square again.

At the machine

Use a universal or jeans needle from 90/14 to 110/18, with 16/100 the ordinary choice. The reinforced shaft of a jeans needle matters here for the same reason it matters on denim: dense cloth deflects a slender needle sideways, and a deflected needle strikes the plate or the hook and breaks.

Sew slowly and let the machine set its own pace. If you hear knocking, or if the fabric begins to pucker, stop rather than pushing through. Ease the upper tension, check that the needle is the right size for the number of layers at that exact point, reposition the work, and start again. Forcing a machine through canvas is how needles snap and how a broken shank ends up somewhere unexpected — under the throat plate, on the floor, in a bare foot.

Corners are where canvas fights. Three or four layers of number 10 duck at a boxed corner is a serious stack; walk it through with the handwheel, and reduce the bulk beforehand by trimming and pressing the allowances flat. Canvas is cotton, so it takes steam and firm pressure from either side without harm, and a well-pressed canvas seam behaves far better than an unpressed one.

Raveling, and finishing the inside

Cut canvas edges shed heavily and the shed threads pack the machine. Finish every interior allowance — zigzag, overcast, serge, or better, bind the allowance with a strip of lighter cotton so the inside of a bag is as tidy as the outside. On a piece that will be handled daily, that binding is not vanity; it keeps the seam from working itself loose over years.

Clean the machine when you finish. Unplug it, take off the throat plate, and brush the packed cotton out of the bobbin area and the feed dogs.

The dignity of the work

Moses reminded Israel, at the end of forty years in the wilderness, of a small and strange mercy: their clothes had not worn out, nor even their feet swelled, the whole long journey through. It is offered as a real, physical kindness worth remembering, not a throwaway detail. Most of us cannot count on garments outlasting decades of hard travel by nothing short of provision, but we can build toward the same idea on a smaller scale, on purpose, with our own hands. A well-built canvas bag that carries groceries for fifteen years without a seam giving way is a small thing next to forty years of unworn clothes in a wilderness, but it is aimed at the same target: something that keeps doing its ordinary job long after a lesser version would have failed. Choose the weight, sew the seam twice where it matters, bind the raw edge, and let it be used hard.