Unit 4: Darning Socks and Knitwear

Reading a Worn Sock Before You Thread a Needle

A sock does not fail all at once. It thins for weeks, goes gray and papery in one small place, and then one morning your toe comes through. The mender who learns to see the thin place has a five-minute job. The one who waits for the hole has a half-hour job and a weaker result. Solomon said the prudent man sees the trouble coming and gets out of its way, while the simple walks straight into it. That is not only about great matters. It is exactly what a worn heel is telling you.

Where the wear happens, and why

Heels and toes wear out first, and they wear out for two different reasons. The toe takes pressure — the shoe presses down, the foot presses forward, and the yarn is crushed against itself thousands of times a day. The heel takes friction, sliding against the back of the shoe with every step. Pressure flattens and compacts yarn; friction abrades it, shaving the fibers off the surface until the plies go thin and fuzzy.

This is why sock knitters build the heel differently from the rest of the sock. A heel flap is a reinforced vertical panel worked across the back of the heel, denser than the leg above it, and made so it can be reinforced or even taken out and reknit entirely. Below the flap, gusset wedges — triangular sections set between the foot and the leg — add strength and ease so the fabric is not stretched thin over the ankle bone. If you turn a handknit sock inside out and find these features, you are holding a garment that was designed to be repaired.

Three grades of damage

Lay the sock flat under good light and stretch it gently over your hand. You are sorting the damage into one of three grades.

Thin but whole. The fabric has gone translucent — hold it toward a lamp and light comes through — but every stitch is still there. This is the best possible moment to work. Swiss darning, also called duplicate stitch, lays fresh yarn directly over the existing stitches and doubles the thickness without a hole ever forming.

A true hole. Yarn has broken and there is an open gap with loose ends around it. This calls for darning proper: a woven repair that builds new cloth in the gap rather than pulling the edges together.

A run or a dropped stitch. In knit fabric, one broken or slipped stitch lets the loops above it unravel downward, leaving horizontal strands across the gap that look exactly like the rungs of a ladder. This is not a hole and should not be darned. It is picked back up with a crochet hook, rung by rung.

Mark the whole area with a contrasting basting thread before you set the sock down, or you will spend ten minutes hunting for the thin place again.

Fiber tells you what to expect

Pilling — the little knots that form when loose surface fibers tangle — depends mostly on how the yarn is built. Tightly structured knits pill far less than loose, softly twisted yarns, because there are fewer fiber ends free to migrate to the surface. Among wools, merino pills less than angora. Among synthetics, nylon resists pilling better than fleece or flannel. A sock that pills heavily is usually a soft-spun sock, and soft spinning also means it will abrade faster at the heel. Expect to mend it sooner, and expect the mend to hold better than the fabric around it.

Fiber also governs the repair yarn you will reach for, which is the subject of the work ahead. Wool asks for wool. Cotton asks for cotton. A repair in the wrong fiber stretches at a different rate than the fabric it is set into and pulls itself loose.

Deciding whether to mend

Not every garment is worth an hour. A sock worn through in three places at once, with the whole heel gone papery, will only fail again next to your careful darn. There is no formula for this — the honest answer depends on what the garment is, what it cost you, and what your evening is worth. But err on the side of mending. Almost everyone who quits sewing quits because the first repair was attempted too late, on cloth too far gone to hold a stitch.

Needles, Yarn, and Thread That Match the Knit

When the tabernacle was built, the people brought what they had — blue and purple and scarlet, fine linen, goats' hair, skins of rams and badgers. Every material had a use, and the right material went to the right place. A mending basket works the same way. Half of a good darn is decided before the first stitch, in the choosing of the needle and the yarn.

The blunt needle, and why it is blunt

Darning is a weaving motion, not a piercing one. The needle slides over and under threads you have already laid down; it should almost never go through a strand. So the tool is a tapestry needle: blunt-tipped, larger than an ordinary sewing needle, with a long eye big enough for yarn. The blunt tip glides between loops without splitting the yarn or snagging a neighbor stitch, and it will not prick your finger a hundred times over the course of an evening's weaving. That last point is not trivial. Repetitive darning done with a sharp needle leaves sore fingertips, and sore fingertips make sloppy stitches.

Keep a fine sharp needle in reach anyway, for anchoring ends and for stitching seams. But for the body of a darn, blunt.

Ballpoint needles for the machine

Some knit repairs are faster by machine, and the machine needs the same courtesy. A ballpoint needle — sold as a jersey needle — has a rounded point that pushes between the loops of a knit rather than cutting through the fiber. Piercing a knit loop severs it, and a severed loop is exactly how a run begins. A ballpoint prevents both runs and skipped stitches.

Sizes run with the fabric:

• 70/10 for lightweight knits
• 80/12 for medium jersey and interlock — the common weight of most T-shirt and sock fabric
• 90/14 for heavier terry and fleece
• 100/16 for the densest fabrics

A needle too fine for the cloth will flex, deflect, and skip stitches. A needle too heavy leaves visible holes. When in doubt on an unknown knit, test on a scrap or a hidden hem before you touch the garment.

Matching the yarn to the sock

The repair yarn should be about as thick as the yarn already in the sock. Perle cotton is numbered so that a lower number is thicker: a size 3 suits a heavy work sock, a size 8 suits a fine dress sock. Mismatch the weight and you will see it immediately. Too thick, and the darn stands proud of the surface as a hard lump under the arch of your foot. Too thin, and the weave sinks into the hole and the surrounding fabric puckers around a depression.

Fiber matters as much as thickness. Wool and merino socks repair best with a soft wool yarn or a silk thread — materials with a similar amount of give. Cotton and synthetic socks take ordinary embroidery thread or a durable sewing thread matched to the original weight. Put cotton into merino and the cotton, which barely stretches, will hold rigid while the wool moves around it until the anchor stitches tear out. Put wool into a synthetic and the wool will felt and shrink at a wash temperature the synthetic does not notice.

If you own handknit socks, look for the leftover ball from the original knitting. Nothing else matches so well.

Length, light, and a tidy basket

Cut a working length of roughly twenty inches. Longer than that and the yarn drags through the fabric again and again on every stitch, fuzzing itself, tangling, and slowing the rhythm of the weave. It is faster to rethread twice than to fight a knot once.

Keep your darning tools together and keep them up high. Tapestry needles are blunt but a crochet hook is not, and small children explore a sewing basket the moment it is set on a low chair. A hanging pincushion, a closed tin, and a habit of putting the hook back the instant you set it down will spare you a great deal.

Setting Up: The Darning Egg and Good Light

Five of the virgins in the parable had lamps and no oil. They were not lazy; they simply were not ready when the moment came. Preparation is the whole difference between a mend that goes smoothly and an evening of frustration. Before a single stitch, get the sock supported, get the light right, and get the workspace safe.

Why the sock needs something inside it

A hole in a knit sock is soft on all sides. If you hold the sock in your hand and stitch, the fabric collapses, your tension wanders, and when the sock goes back on a foot the repair either bunches or gapes. What you need is a smooth, curved surface stretched inside the sock that holds the damaged area at roughly the shape it will take when worn.

A darning mushroom — a wooden dome on a handle — is the traditional tool and the most comfortable, because the handle gives you something to grip and the dome fills a heel or toe naturally. A darning egg does the same job in a smaller footprint. If you have neither, a tennis ball works, and so does a smooth rounded stone, which is what generations of menders actually used. Any of these gives you correct tension during the weaving: the fabric is held open and slightly rounded, not flat and not stretched drum-tight.

The distinction matters. You want the fabric supported, not stretched. If you pull the sock hard over an egg and darn it in that stretched state, the darn will be too small the moment the tension is released, and the whole area will cup and pucker. Slide the support in, ease the fabric over it until the hole lies open and flat, and stop there.

Some menders hold the sock to the egg with a wide rubber band or a hair elastic around the shaft. This frees your left hand entirely and is worth trying. Others prefer a small embroidery hoop for flat knitwear — a sweater elbow, for instance — which does the same work on a garment too large to fit over a mushroom.

Light, and your eyes

Poor light is the most common cause of a crooked darn. You cannot weave over-and-under accurately if you cannot see which strand is which, and by the second row the errors compound. Work under a lamp placed to the side of your working hand so your hand does not throw a shadow onto the stitching. Daylight from a window is excellent for judging color match, but it moves and fades; a steady lamp is better for the weaving itself.

Dark socks are the hard case. Lay a scrap of white or light fabric over your knee, under the sock, so the hole reads as a bright shape against a dark ground. On black wool this one trick is worth more than any tool.

Eye strain leads to inaccurate stitching long before it leads to a headache. If you find yourself leaning closer and closer, stop, look at something across the room for a minute, and go back. A darn done at eleven at night in a dim room is usually a darn done twice.

A safe table

Darning is quiet work with sharp exceptions. A blunt tapestry needle is nearly harmless, but the small sharp needle you use for anchoring ends is not, and a crochet hook has a genuine point. Keep both in a pincushion rather than lying on the arm of the chair, where they roll off, land point-up in the carpet, and find a bare foot at midnight.

If children share the room, take the extra thirty seconds. Count needles in and count them out. Snips and small scissors go back in the basket closed. Set the basket where a toddler cannot reach into it, not where a toddler can only almost reach into it. And when someone calls you away mid-darn, take the needle out of the fabric and park it in the pincushion before you stand up. It costs nothing and it prevents the one accident that would sour a household on sewing altogether.

Laying the Warp Threads Across the Hole

The line and the plummet are a builder's tools — a taut cord for straightness and a weighted string for true vertical. The Lord's use of them is a picture of a standard that does not bend to suit the work. Darning has its own line and plummet. The warp threads you lay across a hole must run straight, parallel, and evenly spaced, because everything woven afterward inherits whatever you set down now. Crooked warp, crooked darn. There is no fixing it later.

Clearing the ground

Turn the sock right side out and settle it over your mushroom or egg so the hole lies open and unstretched. Look at the edges. Broken yarn ends stick up around a hole like a fringe; snip them back with small sharp scissors so they are flush with the fabric, but cut nothing that is still holding. If a strand is intact and simply pulled loose, leave it. It is a live piece of the sock and it will get woven into the repair.

Now find the boundary of the sound fabric. Press your thumbnail outward from the hole and feel where the cloth goes from papery to solid. That solid ring, usually a quarter inch to a half inch out, is where every anchor stitch will land. Anchoring into thin fabric is the single most common reason a good-looking darn tears out within a month: the darn holds fine, and the worn cloth beside it lets go.

Many menders run a light outline first — a simple running stitch in the repair yarn, one full circuit around the sound ring — before laying any warp. It marks the boundary, stabilizes the edges, and keeps the hole from stretching as you work.

Laying the warp

Thread the tapestry needle with about twenty inches of matched yarn. Do not knot the end. Instead, take two or three tiny running stitches in the sound fabric well to one side of the hole; those small stitches lock the yarn and will not press against a foot the way a knot does.

Bring the needle up on the sound fabric below the hole, carry the yarn straight across the opening, and take it down into the sound fabric above. Turn and come back up a short space over, and go down again below. You are laying parallel vertical threads across the hole like the strings of a small harp, each one running from solid cloth to solid cloth with the gap spanned in between.

Two details decide whether this works.

Spacing. Set the threads about one knit stitch apart — roughly a millimeter or two on a fine dress sock, a little more on a heavy work sock. Close enough that the weft will have something to grip everywhere, open enough that the finished darn stays flexible.

Tension. Lay each thread so it just touches the surface with no sag and no pull. Sight along the run of it. If the fabric on either side of the hole draws inward as you place a thread, that thread is too tight; ease it back. This is the hardest habit for a new mender, because the instinct is to pull the hole closed. Do not. The hole stays open at its natural size, and you build cloth inside it.

What it should look like

When the warp is complete you should see a small field of parallel lines spanning the gap, all the same tension, running in the same direction as the knit columns of the sock. Set it on the table and look across it from a low angle. Sagging threads show up instantly; so does a tight one, which will have pulled a dimple into the surrounding fabric.

Extend the warp field a little past the hole on all four sides, so the woven repair will overlap sound fabric rather than stopping exactly at the ragged edge. That overlap is what carries the load. A darn that ends flush with the hole is a darn stitched to the weakest cloth in the sock.

If the warp went wrong, pull it out now. It is four minutes of work and you have lost nothing. Once weft is woven through it, the same mistake costs an hour.

Weaving the Weft: Building New Cloth in the Gap

A single yarn snaps easily. Interlace it with others and it becomes cloth, and cloth carries loads no single strand could. That is the whole principle of the threefold cord, and it is the whole principle of darning. You are not sewing the hole shut. You are weaving new fabric inside it, strand crossing strand, and the strength comes from the crossing.

The over-under motion

The warp is laid. Now turn your work a quarter turn so the warp threads run horizontally in front of you, and begin the weft — the threads that cross them.

Anchor as before, with two or three tiny stitches in sound fabric at one side. Bring the needle up just past the edge of the warp field and take it across, passing over the first warp thread, under the second, over the third, and so on to the far side. Do not stab through the warp. Slide the blunt tip along the surface and let it lift and dip. When you reach the far edge, take one small stitch into the sound fabric to turn, then come back the other way — and this time reverse the sequence. Where you went over on the first row, you go under on the second. That alternation is what makes basketweave. Get it right and the two rows lock each other; get it wrong and you have two parallel threads lying beside each other doing nothing.

Say it aloud the first few rows if it helps. Over, under, over, under. Most beginners lose the count in the middle of a row, and the mistake is invisible until the third row, when the surface starts to look striped rather than woven.

Packing and tension

After each row, use the tip of the needle to comb the new weft thread gently up against the row before it. You want the rows snug — close enough that no warp shows through as a bare line — but not crammed. Overpacking is the more common error. It produces a stiff pad that feels like a coin under the arch of the foot and, worse, it distorts the fabric all around, because you have forced more yarn into a space than the space holds.

Keep the same light tension you used for the warp. Each weft row should lie flat across, not pull the sides of the hole inward. Glance at the outline of the repair every few rows; if it is turning from a rectangle into an hourglass, your weft is too tight.

Work outward past the hole on both ends of every row, into the sound fabric, just as the warp did. The center of the darn is pure new cloth with nothing behind it. The margins are where the new cloth grips the old, and they need to be generous.

Finishing and checking

When the weft has filled the warp field, take the yarn to the back, run it under three or four strands of the darn or the surrounding fabric, and clip it close. No knot.

Now inspect. Turn the sock inside out and look at the underside: it should be a clean woven square, not a nest of loops. Hold it to a lamp — the darn should be as opaque as the fabric around it, with no pinholes of light showing through where the weave skipped. Then stretch the area gently in both directions. A good darn gives a little and returns. If it stands rigid while the sock stretches around it, the weave is too tight and the edges will eventually tear; if it billows loose, the rows were not packed enough.

Finally, run your thumb over it as a foot would. It should read as a slightly firmer patch of the same cloth, flat and smooth. That is what you are after — not an invisible repair, which is a myth on a worn sock, but an honest piece of new fabric doing the work the old fabric can no longer do.

Swiss Darning: Reinforcing a Thin Place Before It Opens

Moses was not told to invent the furnishings of the tabernacle. He was told to make them after the pattern he had been shown. Swiss darning works on exactly that principle. You do not design a repair; you trace the stitches that are already there, following their path exactly, laying fresh yarn on top of tired yarn until the fabric is twice as thick as it was.

The technique is also called duplicate stitch, which is the plainer and more descriptive name. It is embroidery, not weaving, and it belongs to a different moment than the darning already covered: Swiss darning goes in before there is a hole.

Reading a knit stitch

Look closely at the smooth side of a piece of stockinette — a sock leg, a sweater body, the flat face of most machine knits. The surface is made of interlocking V shapes stacked in columns. Each V is one stitch. Its two legs rise from a point at the bottom and spread apart at the top, where they disappear behind the V of the stitch above.

Duplicate stitch simply covers one of those V shapes with a new one in fresh yarn. Bring the needle up at the bottom point of the V, from the back. Slide it right to left behind the two legs of the stitch immediately above — the needle passes under that upper stitch, not through the fabric ground. Then take the needle back down through the same bottom point where you came up. You have drawn a new V exactly over the old one.

Move to the next stitch in the row and repeat. Work across, then move up a row and work back. Use a blunt tapestry needle throughout; a sharp point will split the old yarn and defeat the whole purpose.

Tension is the entire skill

The one thing that goes wrong here is tension, and it goes wrong in both directions.

Pull the new stitches tight and the covered area contracts. The sweater elbow puckers, the sock heel draws in, and the reinforced patch becomes a hard spot that will chafe. Leave them loose and the new V's sit fat and sloppy on the surface, catching on things and eventually snagging out.

The target is a new stitch that matches the size of the old one exactly — no smaller, no larger. Work a few stitches, then stretch the fabric gently sideways and let it relax. If the covered stitches spring back to the same shape as their neighbors, your tension is right. If the area stays gathered, ease off.

Match the yarn weight to the fabric as well. Duplicate stitch already doubles the thickness; if the new yarn is heavier than the original, the reinforced patch will stand up like a scab. On a fine sock heel, a yarn slightly finer than the original is often better than one exactly matched.

Where to use it

Elbows on sweaters, heels and toes on socks, the seat of knit leggings, the shoulder line of a garment carried on a hanger — anywhere you can see the fabric going gray and translucent while every stitch is still whole. Hold the piece to a lamp and cover whatever glows. Extend the duplicate stitching a half inch past the thin area in every direction, so the transition from single to double thickness is gradual rather than an abrupt edge.

This is also the right method for a small snag or a single worn stitch on the front of a sweater, where a woven darn would be obvious and clumsy. Done in matching yarn, duplicate stitch is very nearly invisible from a step away.

Two limits are worth stating plainly. Swiss darning cannot bridge a hole — it needs existing stitches to trace, and a hole has none, so an open gap must be woven instead. And it only works on the smooth stockinette face; it will not follow the path of a rib, a cable, or a purl-side surface, though you can usually turn to the smooth side of a rib column and work there.

Reinforcing before the damage is the thriftiest hour in mending. It costs a few minutes of yarn and doubles the life of a heel.

Picking Up a Dropped Stitch, Rung by Rung

The woman in the parable lost one coin out of ten, and she lit a candle and swept the house and searched until she found it. She did not decide that nine were enough. That is the temper the work ahead requires. A dropped stitch is one small loop out of thousands, and the whole repair depends on finding it, keeping hold of it, and putting back every rung in order.

What a run actually is

Knit fabric is a single yarn looped through itself. Each loop is held by the loop below it. Break or slip one loop and the loop above has nothing to hold it, so it releases, and the one above that releases, and the fabric unzips upward in a narrow column.

What is left behind is not a hole. All the yarn is still there. It has simply straightened out into horizontal strands stretched across the gap, one strand for each row that let go. These strands are called ladder rungs, and they look exactly like the name suggests: a little ladder running up the fabric.

Because no yarn is missing, this damage can be put back almost perfectly. Do not darn a run. Darning over live loops locks a defect into the fabric permanently and wastes a repair that could have been invisible.

Working the hook

You need a small crochet hook — one sized near the yarn, generally a fine hook for sock yarn, a larger one for a bulky sweater. Too large a hook will not fit through the loop; too small a hook splits the yarn.

Find the lowest live loop, the one sitting at the bottom of the ladder. Slide the hook into it from the front. That loop is now safely captured, and this is the moment to stop worrying — as long as the hook is in it, the fabric cannot run further.

Now reach the hook up and catch the lowest rung, the horizontal strand immediately above the loop. Draw that rung through the loop on the hook. The old loop drops off the back of the hook and the rung becomes the new loop. One row is restored. Reach for the next rung up and repeat, and keep going until every rung has been consumed and only one loop remains on the hook at the top of the column.

Work slowly. The rungs are stretched thin and a hasty pull will snap one, which turns a tidy repair into a genuine hole. If a rung feels tight, ease the surrounding fabric sideways with your other hand to give it slack before you pull.

Order, and what happens when you break it

Take the rungs strictly from bottom to top, one at a time, in the sequence they appear. Skip one and you will notice immediately that the ladder no longer sits straight; work on regardless and you finish with a crossed, twisted stitch that shows as a visible knot in the column and is structurally weaker than its neighbors, because the yarn is doubled in one row and starved in another.

There is no way to fix this except to drop the column back down to the error and rework it. It is quicker than it sounds. Slip the hook out, let the loops release down to the bad row, and start again from the lowest live loop.

Watch the fabric face as well. On stockinette, each restored stitch should show as a V on the smooth side. If a stitch appears as a horizontal bump instead, you have pulled the rung through from the wrong side and made a purl where a knit belongs. Drop it and redo it.

Securing the top

When the last rung has been worked, one live loop sits on the hook and it has nothing above it to hold it. Thread a matching yarn on a tapestry needle, pass it through the loop, run the tail into the wrong side of the fabric for an inch or so under several stitches, and clip it. Leave enough tail that laundering will not work it free. Do not knot it against the surface, particularly on a sock, where the knot will press into the foot.

Then look at the column in raking light. Restored properly, it should disappear entirely.

Seaming Knits: Ladder Stitch Instead of Backstitch

David marveled that his own frame had been made in secret, formed with a care he could not see and did not direct. There is a reverence in that verse for hidden, intricate construction — work that holds together beautifully precisely where no one will look. Seams are that kind of work. A seam in knitwear is invisible when it is right, and the difference between right and wrong is a choice of stitch.

Why backstitch fails on a knit

Backstitch is the strongest hand-sewing stitch there is. Each stitch runs backward to meet the end of the one before it, so the thread line is continuous and every stitch is locked by its neighbors. On a woven fabric it is close to unbreakable, and it is the correct stitch for a trouser seam or a bag handle.

It also has essentially no stretch. That continuous locked thread line cannot lengthen. Sew a knit shoulder or a sock cuff with backstitch and one of two things happens: the seam puckers, gathering the stretchy fabric along a rigid line, or the fabric stretches when worn and the thread, having nowhere to go, snaps. Popped stitches along a knit seam are almost always backstitch used where it did not belong.

Running stitch is no answer either. Its stitches are not locked to one another, so a single break lets a whole length of seam pull open, and under the constant tension of a knit it breaks readily.

The ladder stitch

Ladder stitch, also called mattress stitch, is the knit seamer's stitch. It is worked from the right side, and it uses the small horizontal bars that run between the stitch columns along each edge — the same little ladders after which it is named.

Lay the two edges side by side, right sides up, matching row for row. Anchor your thread at the bottom. On the left piece, slide the needle under one horizontal bar between the first and second stitch columns and pull through. Cross to the right piece directly opposite and slide under the corresponding bar there. Cross back to the left, one bar up. Continue, zigzagging between the edges, always taking the same number of bars on each side.

While you work, leave the thread loose — you will see a visible ladder of thread rungs between the two pieces, which is the whole reason for the name. Every inch or two, pull the working thread gently along the direction of the seam. The rungs vanish, the two edges draw together, and the seam closes into what looks like one more column of knitting. Pull firmly enough to close the gap, but stop the moment the fabric begins to gather.

Because the thread travels in a zigzag rather than a straight locked line, it has slack built into it. The seam stretches with the fabric and returns.

Getting it right

Three errors account for most trouble.

Losing the row count. If you take two bars on one side and one on the other, one piece creeps upward and the seam ends misaligned. Match row for row, and check every few inches by comparing a landmark such as a color change or a rib.

Working into the wrong bar. Stay in the same channel — between the first and second column on both pieces — for the entire seam. Wandering in and out shows as a wavy line.

Overtightening. A seam pulled hard is a seam that will pop when the garment is put on. It should stretch as much as the fabric beside it. Test by stretching the seam crosswise before you finish; if it resists while the knit gives, loosen it.

Use a blunt tapestry needle here as well, so you slide under bars rather than splitting them, and match the thread to the fiber — wool yarn for wool, a fine strong thread for cotton or synthetic knits. Finish by running the tail under several bars on the wrong side rather than knotting, and press only lightly, with steam and a press cloth, never with the iron sitting on the seam. Knits scorch and flatten easily, and a crushed seam cannot be uncrushed.

Matching Color and Fiber, or Choosing Contrast on Purpose

Apples of gold in pictures of silver — the proverb praises the right thing set in the right place. A mend is much the same. The yarn is not merely strong or weak; it is fitting or unfitting, and fitness has to do with color, with fiber, and with where on the garment the repair will sit.

Fiber first, color second

Beginners choose by color and regret it. Fiber governs how a repair behaves for the rest of the garment's life, and no amount of color matching saves a mend made in the wrong material.

Wool and merino take wool yarn or silk thread. Both have give, both felt slightly with wear and wash, and both settle into the surrounding fabric until the boundary softens. Cotton takes cotton — embroidery floss or perle cotton — because cotton and cotton shrink at the same rate and neither one drags on the other. Synthetics take a durable sewing thread or embroidery thread matched to the original weight; polyester and nylon do not shrink much at all, and a natural fiber set into them will draw up in the wash while the fabric stays put.

Mixing fibers produces a slow failure that is hard to diagnose. The mend looks fine for a month. Then it begins to pucker, or the edges lift, or the anchor stitches pull loose one at a time, and the mender concludes she is bad at darning when the truth is she used cotton in a wool sock.

Weight matters alongside fiber. A repair yarn about as thick as the original keeps the surface even; too heavy and the darn stands up as a hard patch, too fine and it sinks and the fabric puckers around it.

Reading color honestly

Judge color in daylight, at a window, never under a warm bulb. Incandescent light flatters and will let you pair a brown with a maroon quite happily until you step outside.

Lay the candidate yarn flat on the garment rather than holding it in a loop; a loop reads darker than a single strand and will mislead you toward yarn that is too light. If nothing matches exactly, choose the yarn slightly darker than the fabric. A shade darker reads as shadow and disappears. A shade lighter reads as a highlight and draws the eye straight to it.

Heathered and tweedy yarns are forgiving in a way solids are not, because the eye is already accepting variation. Solid black and solid navy are the hardest of all — carry the garment to the store or work under strong daylight.

For handknit garments, look first for the leftover ball from the original knitting. If it has been stored with the garment, as it should have been, the match is perfect and the discussion is over.

When contrast is the right choice

There is no shame in a mend that shows. A neat darn in a contrasting color, deliberately placed and evenly worked, reads as care rather than poverty — and the person who sees it usually recognizes it as care. On children's clothes especially, a bright darn on a knee or a heel is cheerful, and it teaches children that things are kept and repaired rather than thrown out.

The rule is simply that contrast must look chosen. A tidy oval of red on a gray sock is a decision. A ragged patch of nearly-matching yarn is an accident. If you cannot make it disappear, make it obviously intentional: work the darn as a clean geometric shape, keep the edges straight, and let it be seen.

Where the garment is worn — a sweater front, a dress sleeve, anything that meets people — a modest and well-kept appearance is worth the extra hour. Clothing that is clean, whole, and unremarkable lets people see the person rather than the garment, and there is a real kindness in that. A careful mend serves modesty in a very practical way: it keeps a good garment in service, decent and neat, long past the point where it would otherwise have been given up.

Test before you commit

Whatever yarn you pick, work three or four stitches in an inconspicuous place — inside a cuff, under a hem, in the sole of a sock. Look at it in daylight. Ten minutes of testing has saved many hours of unpicking.

Finishing, Washing, and Keeping a Mended Knit

Better the end of a thing than its beginning, says the Preacher, and the patient in spirit better than the proud. Mending is a plain schoolroom for that. The proud impulse is to finish fast and admire the work; the patient one is to sit ten minutes longer, bury the ends properly, and wash the garment in a way that will not undo an hour's care. The end of the thing is what you will actually wear.

Burying the ends

No knots inside a sock. A knot is a hard bead that presses against the foot inside a shoe, and under repeated pressure it works its way through the fabric and out.

Instead, thread the tail on a blunt tapestry needle and run it along the wrong side, passing under three or four strands of the darn or of the fabric around it. Then reverse direction and run it back under two or three more. That change of direction is what locks it; a tail run one way will slowly work itself out with wear. Clip it flush, but leave enough buried length — about an inch — that laundering cannot free it.

Check the wrong side once more. Long floats of loose yarn on the inside will catch on toenails and pull the repair out from behind. Anything hanging free gets buried or clipped.

Blocking the repair

A finished darn nearly always sits a little proud of the surface. Blocking settles it.

For wool, lay the garment flat, dampen the mended area — a spray bottle or a wrung-out cloth — and pat the darn flat with your fingers, easing it into the plane of the fabric around it. Leave it to dry flat, not hanging. Wool has memory; it will hold the shape it dries in.

If you use steam, hold the iron above the fabric and let steam do the work, or press with a press cloth between the iron and the knit and lift the iron rather than sliding it. Never rest a hot iron directly on a knit and never drag it: the surface flattens and glazes, and a crushed knit does not recover. Synthetics need the lower heat setting. When the fiber content is unknown, start cool, test on a hidden spot, and raise the heat only if you must.

Cotton takes damp pressing well and needs the least caution of the three.

Washing so the mend survives

Wool felts when three things happen together: heat, moisture, and agitation. A washing machine supplies all three, which is why a darned wool sock can come out of a hot cycle smaller and denser than it went in — and the darn, being a different yarn, will shrink at a different rate and pucker.

Wash mended wool by hand in cool water with a wool-safe soap. Do not wring or rub. Press the water out against the side of the basin, roll the garment in a towel to blot, and dry flat. Cotton and synthetic knits handle machine washing, but turn them inside out and use a gentle cycle; a mesh bag protects a fresh repair from catching on zippers and hooks.

Give a new darn one full wash-and-dry cycle before judging it. Yarn relaxes and settles, and a repair that looked slightly lumpy on the table often lies down perfectly after its first wash.

Keeping ahead of the wear

Pilling comes back. Remove pills with a sweater comb or a fabric shaver, working in one direction with a light hand — pulling pills off by hand takes fiber with them and thins the fabric further. Softly spun yarns will pill again, and that is simply their nature.

Then look the garment over about twice a season. Hold heels, elbows, and shoulders up to a lamp and reinforce anything gone translucent with duplicate stitch before it opens. Store handknits folded, not hung, since hanging stretches shoulders out of shape, and keep wool clean going into storage because moths are drawn to soiled fibers rather than clean ones.

Ten minutes of looking, twice a year, is worth more than any repair technique in this unit.