Sashiko and visible mending

Where sashiko comes from

The word sashiko (刺し子) translates roughly as “little stabs”. It developed in the Tōhoku region of northern Japan, largely during the Edo period, under a specific set of constraints: cotton did not grow well that far north, sumptuary laws limited what rural people could wear, and winters were hard. The response was to make cloth last — layering worn hemp and cotton, stitching the layers together for warmth and strength, and patching over patches for as long as the fibres held.

Three things follow from that origin, and they still make the technique easier to understand:

• It is structural first. Dense parallel rows of running stitch through two or three layers make a fabric measurably stronger and warmer. The pattern is a bonus the stitching happens to produce.
• The thread is meant to show. White or ecru cotton on indigo is the classic pairing, and the contrast was not decoration for its own sake — it made the stitching legible enough to follow, repair and extend later.
• Nothing is meant to be finished. A boro textile was worked on for decades. If your first patch is uneven, it is in excellent historical company.

A note on terms you will meet. Moyōzashi (模様刺し) is pattern sashiko — continuous lines of running stitch that draw a design. Hitomezashi (一目刺し) is single-stitch sashiko, worked one stitch per unit on a counted grid, where the pattern only emerges once you have stitched in both directions. Kogin is a related counted technique from the Tsugaru region, worked over the weft threads of an evenweave rather than on a drawn grid.

What you need

A short list, and most of it is cheap. The needle and the thread are the two things worth being fussy about; everything else has a workable substitute already in the house.

Everything here lives on the sashiko and visible mending shelf, with perle and specialty thread and hand sewing needles alongside.

One thing worth buying properly: the yubinuki, the flat ring thimble worn at the base of the middle finger rather than on the fingertip. You brace the needle against it and push with the whole hand, which is why sashiko can be done for an hour without your fingers giving out. A Western dome thimble on the fingertip does a different job and does not really work for this.

Sashiko thread, compared

Sashiko thread is not embroidery floss. Floss is six loosely held strands designed to be divided; sashiko thread is a single unified strand with a low twist and no mercerizing, which is why it stays matte and sits proud on the surface of the cloth instead of sinking into it. It is sold in skeins of roughly 20 to 40 metres, or on larger cards for people who mend a lot.

Fabric to stitch on

Sashiko wants a plain weave, loosely enough constructed to let a thick needle through without a fight. Traditional cloth is indigo-dyed cotton or hemp around 100–150 GSM. In practice:

• Good: quilting cotton, chambray, double gauze, mid-weight linen, cotton sheeting, and the denim you are repairing.
• Harder: tightly woven poplin and sateen, where every stitch is work, and coated or laminated cloth, which will not recover from the needle holes.
• Different technique needed: knits. Jersey and knitwear stretch, so running stitch through them puckers. Darn those instead — see below.

The stitch itself

One stitch, four habits. The stitch is a plain running stitch: up through the cloth, down through the cloth, repeat. The habits are what separate sashiko from ordinary basting.

1. Move the fabric, not the needle

Hold the needle relatively still, braced against the ring thimble, and feed the cloth onto it with the other hand. This feels backwards for about five minutes and then becomes obviously faster. It is also what produces even stitches, because the rhythm comes from the hand gathering fabric rather than from aiming each individual stitch.

2. Load several stitches before pulling through

Gather five or six stitches onto the shaft of the long needle, then pull the whole run through at once. This is the reason sashiko needles are 45–55 mm long, and the reason a short sharps feels wrong for the job.

3. Keep the ratio, not the ruler

Aim for stitches around 3–5 mm on the face, with the gaps slightly shorter than the stitches — roughly a 3:2 stitch-to-gap ratio. At corners and pattern intersections, place a stitch on the corner rather than letting a gap fall there; a pattern with gaps at its junctions looks broken.

4. Ease the thread after every run

This is the step people skip, and it is the reason most first attempts pucker. After pulling a run through, smooth or gently rake the fabric across the direction of stitching with your fingernail. It releases the tension the thread has taken up inside the cloth. Running stitch pulled straight and tight will always draw fabric in; easing (shigoki) is a standard part of the technique rather than a fix for an error.

Starting and finishing

• Traditionally, no knots. Leave a tail, stitch over it, and later bury the end under a few stitches on the back. Knots are lumps that eventually work through the cloth.
• A small knot is fine in practice if it can hide inside a seam allowance or under the patch.
• Never end mid-pattern. Finish at the end of a line or at a natural junction, and start the next thread a stitch or two back, overlapping.
• Thread length: about 50 cm. Longer than that and the tail abrades against the cloth on every pull, going fuzzy long before you have used it.

Patterns worth knowing

Most sashiko patterns are geometric repeats drawn on a grid, and most carry a meaning that comes from the natural world. Start with something built from straight lines — the curves are harder than they look, because the eye catches an uneven arc immediately.

A practical order to learn in: plain parallel rows, then yabane for straight-line turns, then jūjizashi to understand counted hitomezashi, then asanoha, and only then the curved patterns. Working a 15 cm sampler square of each is more useful than reading about them, and the squares themselves make good patch stock later.

Stitch order matters more than it seems. In moyōzashi you work one continuous line all the way across the piece before starting the next — not one motif at a time. It keeps the tension consistent and means far fewer thread ends to bury.

Mending denim, step by step

Denim is where most people start, because denim is where most holes are. Jeans wear through at the knees, the seat, the inner thigh and the back pocket edges — all places where the cloth flexes repeatedly against itself. The general principle: reinforce the thin area, not just the hole. A patch that covers only the hole will tear again at its own edge within a season.

1. Trim and assess. Cut away loose frayed threads back to sound cloth. Then hold the area up to the light — the pale, translucent zone around the hole is thinned warp, and that whole zone is what needs support. It is usually two or three times the size of the visible hole.
2. Cut the patch. Plain-weave cotton or linen of similar weight to the garment, extending at least 2 cm (¾ in) beyond the damage on every side. Round the corners. Square corners are peel points. A patch much heavier than the jeans creates a stiff island that the softer cloth then fails around.
3. Position it behind the hole. Turn the leg inside out to place it, then work from the right side. Baste it in place with long tacking stitches in a contrasting thread rather than pinning — pins shift over a two-hour stitching session and will leave the patch skewed.
4. Mark your lines. Parallel guide lines 5–8 mm apart across the whole patch area. Run them in the direction of least stretch — across the leg rather than along it, on a knee — so the stitching does not fight the way the garment moves. Test the marker on an inside seam allowance first; some water-soluble pens set permanently on indigo.
5. Stitch the rows. Running stitch along each line, roughly 3 mm stitches, working right across the patch and 1 cm or so into the sound cloth beyond it at both ends. Ease the thread after each row. Denser rows mean a stronger and stiffer repair; 5 mm spacing is properly armoured, 8–10 mm stays flexible.
6. Cross-hatch if it needs more. For a high-wear spot like a knee, work a second set of rows at right angles to the first. This is what turns a patch into something that outlasts the rest of the garment.
7. Finish. Bury the thread ends under the stitching on the back. Remove the basting. Press from the wrong side with a cloth — a hot iron directly on sashiko thread flattens the loft that makes it look right.

Mending before it holes

The best version of this is preemptive. When you notice the pale thinning at a knee or a seat but the cloth is still intact, stitch rows straight onto it — no patch needed, or a very light backing one. It takes half the time, looks tidier, and the garment never has a weak point at all. Most antique work clothes were maintained this way rather than repaired after failure.

Shop the sashiko and mending shelf for thread, needles and patch cloth, or canvas and denim yardage if you would rather cut patches from something matched.

Darning knitwear

Knits need a different approach, because running stitch through a stretchy fabric locks it and then tears at the edge of the stitching. Darning rebuilds the missing fabric instead of reinforcing it, by weaving a new grid across the hole.

• Support the hole. A darning mushroom or egg — or a lightbulb, or an orange — held behind the hole keeps it at its natural shape rather than letting it pull closed.
• Secure the edges first. A ring of running stitch about 1 cm outside the hole stops it growing while you work, and gives your weaving something to anchor to.
• Lay the warp. Parallel long stitches across the hole in one direction, anchored in sound fabric at both ends, spaced about as far apart as the original stitches.
• Weave the weft. Work at right angles, going over and under each warp thread, alternating each row. This is literal weaving — you are making new cloth in the gap.
• Match the weight, not the colour. Use yarn of a similar thickness to the knit; a darn in much heavier yarn becomes a hard lump. Colour is a free choice, and a contrasting darn is the honest option.

For a sock heel or a sweater elbow, wool or a wool blend darns best because it felts slightly in wear and closes into the surrounding fabric. Cotton stays distinct. Both are fine; they just age differently. Wool yarn in fingering weight covers most darning.

Boro and layered cloth

Boro (襤褸) means something close to “rags” or “tatters”. It refers to textiles — jackets, bedding covers, work trousers — built up over years and often generations from layered indigo cotton scraps held together with sashiko stitching. A single boro futon cover might carry dozens of patches applied across fifty years by several different hands.

It is worth being clear about what boro was: evidence of poverty. These pieces were made because cloth was expensive and throwing any of it away was unthinkable. They were embarrassing to their owners, and many were discarded once cheap textiles arrived. Museums and collectors now pay a great deal for them, and the aesthetic gets reproduced deliberately with new cloth. Both things are true at once, and knowing the second makes the first more interesting rather than less.

If you want to work in that direction, the practical approach is accumulation rather than design:

• Keep a bag of indigo, chambray and shirting offcuts, and patch from it as things wear rather than buying patch fabric to a plan.
• Let patches overlap and sit at odd angles. Boro reads the way it does because each repair answered a specific hole, not a composition.
• Work plain rows, closely spaced. Decorative patterns are a modern addition to this particular look.
• Let raw edges fray a little. Turning and pressing every patch edge produces something much tidier and much less like boro.

Washing and care

• Prewash the patch fabric. Cotton shrinks 3–5% on first wash. An unwashed patch stitched to a washed garment will pucker the whole area the first time it goes through a machine.
• Expect the thread to shrink too. Unmercerized sashiko cotton takes up slightly on first wash, which usually reads as the stitching settling into the cloth. It is why a finished piece often looks better after one wash than straight off the needle.
• Cold, inside out, gentle. Indigo bleeds — for a long time, on real indigo. Wash a newly mended pair of jeans separately the first two or three times.
• Skip fabric softener. It coats the cotton and dulls the matte loft that makes sashiko thread sit up on the surface.
• Press from the back, with a cloth. A hot iron straight onto the stitching flattens it permanently.
• Line dry where you can. A tumble dryer is hard on the boundary between patch and garment, which is the part under the most stress.

Quick answers

What is sashiko?

A Japanese hand-stitching technique built entirely from running stitch, used to hold layers of cloth together. The name means roughly “little stabs”. It started as reinforcement and repair on work clothes in northern Japan, and the decorative patterns grew out of the practical stitching rather than the reverse.

What thread do you use for sashiko?

Sashiko thread — a loosely twisted, matte, unmercerized cotton sold as a single strand you never divide, in thin, medium and thick weights. Perle cotton is the best easy substitute: #8 for fine work, #5 for denim. Perle and specialty thread covers both.

Can I use embroidery floss for sashiko?

Yes, with three to six strands together, but it is a compromise. Floss is built to be split, so along a long running stitch the strands separate and flatten instead of holding one round line. Fine for learning with what you have; not what to buy.

How long should sashiko stitches be?

About 3–5 mm on the face, with gaps slightly shorter than the stitches — near a 3:2 ratio. Consistency matters far more than the exact number. Even 5 mm stitches look deliberate; stitches wandering between 2 and 6 mm look accidental however neat each one is.

Do I need a special needle for sashiko?

A sashiko needle is 45–55 mm long with a strong shaft and a wide eye, and the length is functional — you load five or six stitches before pulling through. A chenille needle stands in acceptably; a standard sharps is too short for the rhythm. Needle types explained →

What is the difference between sashiko and boro?

Sashiko is the stitching technique. Boro is the object it produces over time — a textile layered and patched across years or generations, held together with sashiko stitch. Boro means something close to “rags”.

Should the patch go inside or outside the jeans?

Behind the hole for strength and softness against skin, letting the frayed edges show — that is the classic visible-mending look. On top for a deliberate design block that hides the damage completely, at the cost of exposing the patch’s own edges to wear.

Why does my sashiko pucker?

Almost always because the thread was not eased. After each run of stitches, smooth the fabric across the direction of stitching to release the tension the thread has taken up. Running stitch pulled tight along a line will always draw the cloth in. Prewashing the patch fabric matters too.

Can you machine sashiko?

You can approximate it with a long straight stitch and heavy topstitch thread on a topstitch needle, and for a purely structural repair that is a reasonable shortcut. It will not look like sashiko, though — the appeal is the slight irregularity of hand stitches and the loft of untwisted cotton, neither of which a machine produces.