Unit 6: Preparing Fabric Before You Cut

What Shrinkage Does to a Finished Garment

Our Lord's picture of the man who builds without counting the cost is a fair description of the sewist who cuts into cloth she has never washed. The seams may be beautiful. The hem may be even. And the first trip through the laundry can still take the whole thing away from her. Counting the cost, in sewing, means finding out what your fabric will do before it is a garment rather than after.

Cloth is under tension when you buy it

Yarn is pulled tight on the loom, and the finished cloth is pulled tight again through the finishing machinery, dried under tension, and rolled onto the bolt while it is still stretched. Those yarns are not resting. They are held long. The first time water soaks into the fiber, the yarn relaxes, thickens slightly, and takes up more crimp as it passes over and under its neighbors. Taking up more crimp means it needs less length to travel the same number of interlacings, so the cloth draws in. That is nearly all of what we call shrinkage: not fiber disappearing, but fiber finally relaxing.

This matters because it happens once, in bulk, and then largely stops. You can spend that movement on a scrap in a sink, or you can spend it on a finished dress.

How much movement to expect

Untreated cotton commonly draws in about three to five percent on its first wash under ordinary conditions. That is a range, not a promise; a loose gauzy weave and a tight shirting behave differently, which is why a test on the actual yardage in your hands beats any published figure. Hot water above 60 degrees Celsius, roughly 140 degrees Fahrenheit, can drive untreated cotton as far as twenty percent. Machine drying on heat adds a further five to eight percent on top of whatever the wash took.

Linen moves about three to four percent when washed cold, and ten percent or more when the water goes above about 30 degrees Celsius. Cotton that has been sanforized at the mill has already given up most of its movement and typically shifts only one to two percent.

Translate the percentage into inches

Percentages feel harmless until you put a tape measure on them. Take a straight skirt cut 26 inches long. Five percent of 26 inches is a little over an inch and a quarter — a hem gone, and a length that now sits at an awkward place on the leg. Across a 44-inch width, five percent is more than two inches, which can be the difference between a bodice front that fits on the fold and one that does not.

Sleeves are the cruelest. A sleeve shortened by three quarters of an inch reads instantly as wrong, and there is no ease anywhere in a set-in sleeve to borrow from.

What it looks like when it goes wrong

A garment cut from unwashed cloth usually fails in three ways at once after the first laundering. It becomes short in the body and the sleeve. It becomes tight through the chest and hip, because the crosswise yarns drew in too. And it puckers along seams and hems, because the thread and the interfacing did not draw in at the same rate as the cloth around them. That last symptom is the one people mistake for bad stitching. It is almost never the stitching.

There is also the quiet failure: nothing tears, nothing puckers, but the whole garment twists a little on the body, so a side seam creeps toward the front. That is grain shifting during the wash, and it is a separate problem we will square up later.

Deciding what to preshrink

The rule is simple and worth keeping: if the finished item will ever be washed, wash the fabric first, in the way the finished item will be washed. A dress that will go in the machine gets machine treatment now. A wool coat that will only ever be brushed and aired needs relaxing, not laundering. Interfacing gets treated too, because it must move the same amount as the cloth it is fused to.

The work costs an afternoon and a bit of patience. Sewing done for a household, on a budget, out of necessity, cannot afford to lose a whole dress to a step that costs nothing but time. "Whatsoever ye do, do it heartily, as to the Lord" reaches all the way back to the sink, before a single pin goes in.

What "Preshrunk" and "Sanforized" Really Promise

The end of a bolt is printed with words that sound like guarantees. Preshrunk. Sanforized. Ready to sew. Long before mills existed, a prophet was given a plain and specific instruction about a linen garment: get a linen girdle, put it on, and put it not in water. It is a homely, exact piece of textile handling — linen and water do not mix carelessly, and the instruction assumes the hearer already knows that much about how the fiber behaves. A careful sewist reads a bolt-end claim the same exacting way: as useful information about how a fabric will meet water, not as a settled promise that lets her skip finding out for herself.

Sanforization is a real mechanical process

Sanforization is a patented process, developed in 1930, that preshrinks woven cloth at the mill after weaving and before it ever reaches a garment factory. The fabric is fed between a thick rubber sleeve and a heated rotating cylinder. The rubber is stretched as it goes around the drum and then allowed to contract, and the damp cloth pressed against it is compressed lengthwise along with it. The yarns are physically crowded together and forced to take up the crimp they would otherwise have taken up in your washing machine.

It is not a coating and not a chemical treatment. Nothing has been added to your fabric that will wash away. The movement has simply been spent in advance, under controlled steam and pressure, instead of in your sink.

The result is substantial. Cloth that might have moved around ten percent is brought down to roughly one to two percent.

What the label does not say

Here is where beginners are misled. "Preshrunk" does not mean "will not shrink." It means the bulk of the available movement has already been taken out. One to two percent still remains, and one to two percent is not nothing: on a 30-inch skirt length that is a quarter to a half inch, and on a sleeve it is visible.

The label also cannot know how you will launder the garment. A mill preshrinks under a particular set of conditions. If you then wash the finished dress hotter than the mill treated the cloth, or tumble it dry on high heat, you can pull out movement the process never accounted for. Heat is yours to control, and the label has no say in it.

Two further gaps are worth naming. First, the term applies to the cloth, not to everything you will sew into it: the thread, the interfacing, the trim, the pocket lining and the twill tape were never part of that promise. Second, "preshrunk" is not a regulated grade with a published tolerance you can appeal to. Treat it as the maker's word.

Reading a bolt end honestly

When you have a bolt end in front of you, take down the fiber content and the width and any care instruction, and note whether preshrunk or sanforized appears at all. Fabric sold from remnant tables, from an estate, or handed to you by a friend usually arrives with no information whatever, and you should assume it is untreated until you prove otherwise.

Blends need a further thought. A cotton-polyester shirting will move less than pure cotton because only part of the yarn is cotton, but it still moves, and the two fibers do not move together. Rayon and viscose can shrink considerably and can also relax and grow when hung. None of these behaviors can be read off a label with any confidence.

The practical position to take

Do not argue with the bolt end and do not trust it either. Preshrink anyway. Washing an already-sanforized cotton costs you an hour and takes out the residual movement, softens the hand, removes the mill's sizing, and tells you plainly whether the dye is stable. Nothing is lost by the extra wash, and one uncertainty after another is closed.

That is the same lesson tucked inside the instruction to keep a linen girdle out of water. It was not a blanket rule against ever washing linen; it was a specific, deliberate act with a known and predictable result, chosen because the one giving the instruction understood exactly what water would do to that particular garment in that particular use. You are being asked for the same kind of specific knowledge, not blind trust in a printed word and not blind suspicion of it either. Know what preshrunk and sanforized actually promise, know what they leave unsaid, and decide what water and heat you will allow the cloth to meet, on purpose, before it becomes someone's garment.

Sizing, Starch, and the True Hand of New Cloth

Peter tells the women of the church to prize what is underneath rather than what is applied on the surface, because the applied thing does not last and the hidden thing does. That is spiritual counsel first, but it happens to describe a bolt of new fabric exactly. What you feel in the shop is partly a finish that will be gone after one wash. What is underneath is the cloth you will actually be wearing, and the quiet, lasting quality is the one worth choosing for.

What sizing is

Sizing is a temporary finishing compound applied to fabric to give it crispness, body, weight, and a little sheen. Starch is the familiar one; gelatin and fine clay have also been used. It is put there to make the goods handle well through the finishing and rolling machinery and to make them look their best on the bolt. It is not part of the weave and it was never meant to stay.

Sizing dissolves in water. The first proper wash takes most of it out, and that step has its own name: desizing. You will sometimes feel the water go slightly slick, and the cloth will come out of the sink noticeably limper than it went in.

Why this changes what you are sewing

Hand and drape are the two things sizing hides. Hand is how a cloth feels between your fingers — crisp, soft, dry, papery, springy. Drape is how it falls when you hold a length of it up and let it hang. Both determine whether a pattern will look like the picture.

Consider a beginner choosing fabric for a gathered skirt. She wants some body so the gathers stand out, and in the shop she finds a cotton that seems perfect: firm, a little stiff, holds a fold. She takes it home, washes it, and finds a soft limp cloth that hangs close to the leg. The fabric did not fail. She was reading the starch.

The reverse happens too, and more pleasantly. Linen is often sold quite stiff and boardy, and beginners avoid it for that reason. Washing linen removes the finish and softens the fiber itself, and after two or three launderings it becomes the supple, cool, forgiving cloth people love. Preshrinking linen is worth doing for the softening alone, quite apart from shrinkage, because soft linen is easier to handle under the needle than stiff linen.

Judging fabric through the finish

You cannot always wash before you buy, so learn to test in the shop. Take a corner of the cloth and crush it firmly in your fist for a few seconds, then open your hand. Heavy sizing gives a hard, papery crunch and holds sharp creases. Scrunch a doubled section and rub the two faces together; a starched cloth makes a dry scratching sound. Then let a yard hang over your forearm and watch whether it falls in soft folds or stands away in a cone.

If you suspect a heavy finish, ask for a small swatch, wash it in the sink at home, and let it dry before you commit to the yardage. A shop that sells to sewists will usually oblige.

After desizing

Expect three changes once the finish is out. The cloth is softer and often slightly thicker to the fingers. The color may read very slightly deeper or duller, since sizing adds sheen. And the cloth will shift more freely under your hands, which means it can slide during cutting where before it lay obediently still.

That last one is worth preparing for. Cut soft desized cotton and linen on a surface that grips a little, use plenty of weights or fine pins, and let the whole piece rest supported rather than hanging off the table edge, where its own weight pulls the grain.

If you genuinely need body in a soft cloth, add it deliberately after washing — with a light spray starch pressed in just before cutting, with interfacing, or with a lining — rather than depending on a mill finish that will vanish in the first laundering. Build what is underneath, and let the surface be honest about it.

Water Temperature and Dryer Heat: The Two Levers You Control

Almost everything that goes wrong in preshrinking comes down to heat, and heat is entirely in your hands. A sewist who learns to rule the dial has solved most of this subject. The proverb praises the one who rules his own spirit above the one who takes a city, and there is a small domestic echo of it here: the patient cool cycle beats the forceful hot one every time.

Heat is the driver, not the water

Water alone is enough to relax fibers. Soaking cloth in cool water lets tensioned yarns take up their crimp and draw in gently. Add heat and you do not simply speed that up — you push the fibers further than relaxation, swelling them harder, loosening the finish faster, and taking out more length than the fabric would ever have given up on its own.

The pattern is consistent. Cold water produces the least movement. Warm water, in the region of 40 degrees Celsius or about 105 degrees Fahrenheit, produces noticeably more. Hot water at 60 degrees Celsius, about 140 degrees Fahrenheit, and above produces the most: untreated cotton can go as far as twenty percent there, against the three to five percent typical of an ordinary wash. Linen shows the same behavior, moving three to four percent cold and ten percent or more once the water rises above roughly 30 degrees Celsius.

Beginners often reach for hot water on the reasoning that a thorough hot wash now will "get the shrinking over with." It does the opposite of what they want. It takes out shrinkage the garment would never have suffered in normal wear, leaving a piece of fabric smaller than it needed to be, harsher in hand, and more likely to have bled its dye.

The dryer is the second lever

The wash is only half the heat. Tumble drying on a hot setting adds a further five to eight percent shrinkage on top of whatever the wash took, and it does it while the cloth is being beaten around a drum. High heat also overdries fibers, which leaves cotton feeling brittle and papery and can make linen crack along hard fold lines.

If you must use a dryer, use the lowest heat setting available and take the cloth out while it is still faintly damp. Better, for preshrinking, is to skip the dryer entirely and dry the fabric flat.

Match the treatment to the garment's future

There is one sensible exception to "cool is best." Preshrinking should imitate the hardest treatment the finished item will actually receive. Cloth for a baby's bedding or kitchen towels that will be washed warm and tumbled every week should be preshrunk warm and tumbled, because those items will meet that treatment for years and you want the movement out now. A good dress that you will wash gently and hang to dry needs only a gentle preshrink.

What you must never do is preshrink gently and then launder the finished garment hot. That is the sequence that ruins clothing.

Working the machine

Machines label temperatures differently, and one maker's "cold" is not another's, so the temperature word on the dial is a poor control. The cycle setting is more dependable: the delicate or gentle cycle runs cool water with low agitation and a low spin speed, which is exactly what preshrinking wants. A hand-wash cycle is gentler still and takes longer.

Low agitation matters as much as low temperature. Agitation is mechanical work on the yarns; it frays cut edges into a mat of loose threads and pushes the grain out of square. Overlocking or a wide zigzag along the two cut ends before washing keeps a whole length from unravelling and saves you cutting waste later.

Finally, wash your yardage by itself or with like colors only. It is a large, heavy, unhemmed piece of cloth, and it will tangle around anything else in the drum.

The Twelve-Inch Square: Measuring Your Own Fabric

Scripture takes measuring seriously enough to legislate it. A just measure is a form of honesty, and honest measuring is also the only way to learn what a particular piece of cloth is going to do. Published shrinkage figures are averages across whole classes of fabric; the piece folded on your table has its own weave, weight, and finish. A test square answers for that piece and no other, and it takes about ten minutes of work spread over a day.

Cutting the sample

Cut a square from a corner of your yardage, well away from the selvage if you can spare the width, and make it at least 12 inches on a side. Bigger samples give clearer results, because a percentage read off a small square is easily lost in measuring error. Cut on the grain, following a single yarn if the weave is loose enough to see.

Mark the lengthwise direction before you do anything else. A safety pin near one corner pointing along the warp is enough, or a few hand stitches in contrasting thread. Once a square is out of the yardage and wet, lengthwise and crosswise become very hard to tell apart, and the two directions rarely shrink the same amount.

Overlock or zigzag all four edges. A raw-edged square frays into fringe in the wash and you will not be able to find the original edge to measure to.

Marking and measuring before

Do not measure edge to edge. Instead, mark two reference lines well inside the square, so fraying cannot affect them. With a fine permanent marker or a few tacking stitches, place marks exactly 10 inches apart along the lengthwise direction, and another pair exactly 10 inches apart across the crosswise direction. Write the two numbers down.

Ten inches is convenient because the arithmetic becomes easy. If the lengthwise pair measures 9.5 inches after washing, you have lost half an inch out of ten, which is five percent.

Washing and drying the sample

Treat the square exactly the way you intend to treat the yardage, and exactly the way the finished garment will be treated. Same cycle, same water temperature, same drying method. A test done on the delicate cycle tells you nothing about a garment you plan to wash warm.

Dry the square flat, unless the finished garment will be tumbled, in which case tumble it. Let it dry completely — a laid-flat sample can want six to twenty-four hours depending on the room — because damp cloth reads shorter than it will finally be. Press it lightly with a dry iron at the correct setting for the fiber before measuring, since wrinkles steal measurable length.

Reading the result

Measure between your marks again. Subtract the new figure from 10, divide by 10, and multiply by 100. A pair of marks reading 9.7 inches means 0.3 divided by 10, which is three percent. Do the lengthwise and crosswise directions separately and record both, because a fabric that moves two percent one way and six percent the other will need very different allowances.

Now decide what to do with the number. Under about two percent, the yardage you bought is almost certainly enough. Between two and five percent, buy or set aside extra: on a three-yard cut, five percent is more than five inches of length. Above five percent, or if the two directions differ sharply, wash the whole yardage twice before cutting and measure the piece again, because a single wash may not have finished the movement.

Keep the squares. Write the fabric, the date, the treatment, and both percentages on a slip of paper pinned to each one, and put them in a box. Within a year you will have a small honest reference of your own, worth more than any table of averages, and it will tell you at a glance what to expect from the next similar cloth you bring home.

Preshrinking Cotton and Linen Step by Step

Let thy garments be always white, Ecclesiastes says, in a short verse about keeping up appearances that quietly assumes something practical: garments do not stay white, or clean, or true to size, without ongoing care. Cotton and linen especially will not hold their finish on their own. Preshrinking is the least glamorous form that care takes. Nobody enjoys the afternoon spent washing cloth that is not yet anything. It is still the step that decides whether the finished dress is still a dress in a year, and whether it will still hang white and true rather than puckered, shrunk crooked, or gray from mishandling.

Prepare the yardage

Take the fabric off its fold and open it out full width. Folded cloth washes unevenly, and a hard fold line pressed in at the mill can hold a crease that will not come out.

Finish both cut ends before they go anywhere near water. An overlocked edge is ideal; a wide zigzag at about 4 mm width and 2 mm length does the same job on any machine. Raw ends will unravel through a wash cycle and can leave you an inch or two of tangled fringe on a length you paid for. If you have no machine to hand, a row of long hand basting a half inch in from each end will hold.

Look for anything that will not survive the wash: pinned price tags, staples through the selvage, a paper band. Take them out.

Wash

Use the delicate or gentle cycle, cool water, and a low spin. A small amount of mild detergent helps release the mill's sizing; a heavily starched cloth benefits from it, and plain water is fine for cloth that already feels soft. Skip fabric softener entirely — it leaves a residue that can interfere with fusible interfacing and with the way the cloth takes a press.

Wash the yardage alone, or with fabrics of like color only. A large unhemmed length is heavy and it will wrap itself around anything else in the drum.

If your test square showed more than about five percent, run the cycle twice before you cut. The second wash usually takes out a further fraction, and it is far better spent now.

For linen, expect the cloth to come out softer and more pliable than it went in. That is the fiber relaxing, and it is a gain, not a loss.

Dry flat

Lift the wet cloth out supported in both arms rather than by one corner. Wet fabric is heavy, and its own weight will pull the grain out of true in seconds if it hangs from a single point.

Spread it in a single layer on a sheet or a few dry towels, on a floor, a bed, or a large table, smoothing it square with your hands as you go. Straighten the selvages so they run parallel, and square the cut ends. If the piece must go on a table, keep it entirely on the surface; a heavy wet section hanging over the edge drags the whole piece and can pull it to the floor.

Give it time. A laid-flat length can want anywhere from six to twenty-four hours depending on the room, and it must be completely dry before you cut, or it will shift under the pattern and go on shrinking afterward.

Press

Press while the cloth is very slightly damp, or with steam. Cotton takes a hot iron; linen takes the hottest setting with plenty of steam and often needs pressing from the wrong side to avoid shine on dark colors.

Press along the grain — up and down the length, then across the width — lifting and setting the iron rather than pushing it in circles. Circular ironing on damp cloth is one of the commonest ways beginners knock a piece off-grain after taking the trouble to preshrink it.

Set the iron on its heel every time you let go of it, keep the cord out of a walkway, and keep small children out of the room while it is hot. An iron left face-down on cloth for a few seconds will scorch, and on the floor it is a serious burn waiting for a curious hand.

When the piece is dry, pressed, and square, it is finally what it looked like on the bolt: fabric you can trust to stay the size you cut it.

Wool: Relaxing the Fiber Without Felting It

Wool is the fiber that punishes carelessness fastest, and it is also the one worth learning, because a well-made wool garment outlasts everything else in a wardrobe. The women in Exodus who spun goats' hair for the tabernacle were working with a fiber that demands respect and gives long service in return. Handled wrongly, wool ruins itself in a single wash cycle, and no amount of skill afterward brings it back.

Felting, and why it cannot be undone

Wool fibers carry a scaled surface. Wet the fiber, warm it, and agitate it, and those scales ratchet against one another and lock. The fibers mat together, the cloth thickens, hardens, and draws in dramatically, and it stays that way. That is felting, and it is permanent — no soaking, stretching, or steaming will unpick it.

The important part is that three conditions must meet: moisture, heat, and agitation. Take away any one of them and you can wet wool safely. That single sentence is the whole method.

So: never put wool through a conventional wash cycle, and never put it in a tumble dryer, even on low. The dryer supplies heat and agitation together and is the surest way to destroy a good piece of cloth.

The cool soak

Fill a clean tub or basin with cool or lukewarm water — comfortable to the hand, never hot. Lower the wool in, opened out flat rather than balled, and press it gently under the surface with your palms. Do not swish, rub, or stir. Let it sit twenty to thirty minutes so the fibers take up water and relax.

Lift it out supported underneath, because saturated wool is very heavy and will stretch badly under its own weight. Never wring or twist it. Press the water out by squeezing gently against the side of the basin, then lay the piece on a thick dry towel, roll the towel and the wool together like a jelly roll, and press down along the roll with flat hands. Unroll, move to a dry towel, and lay the wool flat, smoothing it square.

Wool dries slowly; a coating weight can want a full day or more. Turn it once partway through and give it a fresh dry towel underneath.

The steam hover method

For tailoring wools, and for any wool you would rather not immerse, steam alone will relax the fibers. Set the iron to its wool setting with steam, hold it about an inch above the surface, and move steadily over the cloth so the steam penetrates without the soleplate ever touching. Work in overlapping passes across the whole piece.

Then leave it strictly alone. Let the wool lie flat and cool completely, at least half an hour, before moving it. Wool is soft and shapeable while warm and damp and it sets as it cools, so a piece lifted warm will keep whatever distortion you gave it.

Steam burns worse than dry heat because it carries so much energy into the skin. Keep your free hand behind the iron rather than under the vents, and keep children out of range of a steaming iron entirely.

What goes wrong, and what it looks like

If a piece comes out noticeably thicker, stiffer, and smaller, with the weave harder to see, it has felted. Do not fight it. Cut it into a bag, a pot holder, or a pair of insoles; felted wool does not fray, which makes it useful for exactly those things.

If it comes out limp and longer than it started, it was hung wet, or lifted by a corner, or wrung. Wet wool stretches easily and does not always spring back.

If it comes back smelling strongly of sheep, that is only lanolin waking up in the damp; it fades as the cloth dries and airs.

Wool also does not need washing nearly as often as cotton. A relaxing soak or steam before cutting is preparation, not laundry. Once the garment is made, brushing and airing keep it fresh far longer than water ever will.

Dye Bleeding: Keeping Dark Colors Where They Belong

Isaiah reaches for a dyer's picture because everyone in his hearing knew it: scarlet and crimson were the colors that would not come out. The prophet's point is that God can do with sin what no launderer could do with dye. Our small practical concern runs the other way — we want the color to stay exactly where the weaver put it and to go nowhere else — and preshrinking is where you find out whether it will.

What bleeding is

Bleeding is unfixed dye leaving the fiber and dissolving into the wash water, where it is free to settle on anything else in the load. Not every molecule of dye bonds to the fiber during manufacture; the surplus sits on the surface and rinses away the first time the cloth meets water.

The related fault is crocking, which is dry color transfer — the fabric rubs against a light-colored seat, a glove, or another garment and leaves color behind without any water at all.

Two things make bleeding predictable. Reds, and dark blues and purples, bleed the most; those dye classes hold to fiber less securely than most others. And the first wash releases far more dye than any later one, which is precisely why you want it happening to a piece of yardage in an empty machine rather than to a finished garment among the family's white shirts.

Temperature governs it as well. Hot water swells the fiber and opens it up, and more dye escapes. Cool water keeps the fiber closed and holds the dye in place. Once again, cool is the safer setting.

Test before you commit

Cut a six-inch square from your dark fabric and soak it by itself in a bowl of cold water for ten minutes. Lift it out and look hard at the water against a white sink or a sheet of white paper. Clear water is a good sign. A visible tint tells you this cloth will give up color.

Then run the second half of the test, which matters more. Put the dark square and a scrap of white or pale cotton together in fresh cold water for another ten minutes, then dry the pale scrap and look at it in daylight. If it has picked up any cast at all, you know not to pair that fabric with a light one in a garment or in a wash basket.

Repeating both halves with warm water at around 40 degrees Celsius shows you plainly how much difference temperature makes, and it settles the argument for cool washing better than any explanation.

Preshrinking a heavy bleeder

Wash the piece by itself, cool, on the delicate cycle. Look at the drain water or the rinse water; if it is still colored, run the cycle again. Repeat until the water is clear or nearly so. Some deep-dyed cottons and linens want three or four passes, and a few never stop entirely.

Start with a clean machine or a clean sink. Lint or dye residue from a previous load transfers onto pale fabric readily, and it is a maddening thing to discover on a finished garment.

Designing around a fabric that will not stop

If a cloth still bleeds after several washes, that is information, not a disaster. Use it where the bleeding costs nothing: a garment made entirely in that color, with dark thread, a dark lining, and dark interfacing. Do not use it for a white collar, a pale contrast band, or a light yoke, and warn whoever will wear it to launder it separately and cool.

Keep the pale fabrics of a project physically apart from the dark ones through the whole preshrinking process — separate wash, separate drying towels, separate shelf. A little order at the beginning saves a garment you have put twenty hours into, and there is no way to take crimson back out of white cloth once it is there.

Squaring the Grain Before the Pattern Goes Down

Paul's word for the faithful teacher is a workman who divides rightly and has nothing to be ashamed of. Cutting cloth is a smaller thing than handling Scripture, but the image is exact: everything downstream depends on dividing along the true line. A garment cut off-grain will hang crooked no matter how well it is sewn, and the sewist will never be able to say why it looks wrong.

What grain is

A woven fabric is two sets of yarns crossing at right angles. The lengthwise yarns run parallel to the selvage — the firm finished edges — and that direction is the lengthwise grain, the strongest and least stretchy direction. The crosswise yarns run selvage to selvage and give a little more. The diagonal between them is the bias, which stretches a great deal.

When those two sets sit truly square to one another, the cloth is on grain. When washing, careless drying, or a mill finish has skewed them into a shallow parallelogram, the cloth is off-grain, and any piece cut from it carries the twist into the garment. Side seams creep toward the front, a hem dips, a skirt swings crooked.

The fold and match test

Lay the piece on a large flat surface. Fold it in half lengthwise so the two selvages lie exactly on top of one another, and smooth outward from the fold with your hands without pulling.

Now look at the folded cut end. If the two layers finish flush and the end lies square to the fold, the grain is true. If the top layer runs past the lower one, or the end gapes open in a wedge, the cloth is off-grain by that amount. A quarter inch across a folded width is minor. Two inches is a real skew that must be corrected before cutting.

Check the fold itself too: a piece that is on grain lies flat with a smooth fold, while a skewed piece will not lie down and shows soft ripples along the folded edge.

Finding a true crosswise line

Before you can straighten anything you need an honest crosswise edge. Snip through the selvage an inch from the cut end, catch a single crosswise yarn with a pin, and draw it gently while easing the fabric along it. The yarn pulls out or gathers the cloth into a pucker that marks its path all the way across. Cut along that line and you have a cut end that follows one yarn exactly. On firm plain-weave cotton you can often tear across instead, which follows a yarn perfectly, though it can stretch the last inch or two, so trim that off.

Blocking it square

With a true crosswise edge, straightening is a matter of pulling the fabric back against its skew. Dampen the piece lightly, then take hold at the two corners of the short diagonal — the diagonal that has become too short — and pull steadily. Two people, or one person with the opposite corner pinned or held under a knee, works best. Work along the whole length in stages rather than yanking the ends once.

Then lay the piece flat, square the corners with your hands or a large right-angled ruler, pin it to a padded surface at the corners if you can, and let it dry fully. It sets in the shape it dries in.

Keep the pull gentle. Aggressive stretching distorts the weave permanently, and loosely woven cloth is easy to ruin this way. If a finish has set the weave crookedly at the mill, gentle blocking may improve the piece without fully correcting it; in that case cut single-layer, following the true grain you can see, and accept a little waste rather than a twisted garment.

Test again with the fold when the piece is dry. Only then does the pattern go down.

Preshrinking Interfacing So It Moves With the Cloth

Our Lord's illustration is drawn from plain sewing experience: put a piece that will move one way onto a garment that will move another, and the join tears itself apart. Every sewist who has fused a crisp interfacing into a collar and watched it bubble after the first wash has seen the principle demonstrated in her own work. Two layers permanently bonded together must shrink at the same rate, or neither one is left in peace.

Which interfacings need it

Woven interfacing is made like any other cloth, with warp and weft, and it relaxes and draws in like any other cloth. Preshrink it.

Weft-inserted interfacing carries yarns laid in one direction, usually crosswise, within its structure. It behaves like a woven and shrinks like one. Preshrink it.

Nonwoven interfacing is made of fibers bonded together rather than spun into yarn and interlaced. There is no tensioned yarn waiting to relax, so it does not need preshrinking.

Fusible interfacings of any construction carry a heat-activated adhesive on one face, and that adhesive layer can behave differently from the fibers carrying it. Some fusibles are sold marked as needing no preshrinking. Treating them anyway costs little and takes the question off the table, which is the safer course when the garment is one you have spent days on.

The water soak method

Put the interfacing in a basin of warm water and let it sit, without agitation, for about ten minutes. Support it as you lift it out. Do not wring it; wringing can crack the adhesive coating and start it separating from its backing.

Lay it on a dry towel, roll the towel up with the interfacing inside, and press along the roll to take out the surplus water. Then lay it flat, adhesive side up, and let it dry completely. Do not hang it and do not put it in the dryer.

The steam hover method

The alternative is steam. Lay the interfacing on the ironing board adhesive side up, set the iron to steam, and hold the soleplate about an inch above the surface. Move it slowly across in overlapping passes so the steam soaks in. The soleplate must never touch the adhesive.

This is where the caution belongs. Touching a hot iron to the adhesive face melts the glue instantly. It bonds to your soleplate or to the ironing board cover, it is a wretched job to clean off, and it can ruin a board cover outright. Keep a press cloth within reach and keep your free hand well clear of the steam vents.

When the passes are done, leave the piece flat until it is cool and fully dry before you move or cut it.

Matching, and what a mismatch looks like

Preshrink the fashion fabric and the interfacing in the same session and then measure both. Mark two points 10 inches apart on each before treatment and check them after, exactly as you would for a shrinkage test square. If the interfacing has moved appreciably more or less than the fabric, treat it a second time, or pair that fabric with a different interfacing.

A mismatch shows up as bubbling, rippling, or a puckered orange-peel texture across a collar, cuff, waistband, or front band, sometimes only after the second or third laundering. The fusing itself does not fail; one layer simply becomes shorter than the other and the excess has nowhere to go. It cannot be pressed out and it cannot be repaired without removing the interfacing altogether.

Preshrink the thread's companions too where you can — twill tape, waistband stiffening, and pocket lining all belong in the same wash as the fabric they will serve.