Sashiko and Boro: The Japanese Art of Mending, Socks Included

A sock with a hole in the heel is one of the few garments almost nobody repairs any more. It costs less than the thread, the needle and the twenty minutes. For most of Japanese history that arithmetic ran the other way round, and the result was two of the most quietly beautiful traditions in the country's textile history: boro, the cloth that was never thrown away, and sashiko, the stitching that held it together.

This is not a nostalgia piece. The techniques work, they take an evening to learn, and the last section shows exactly how to use them on a pair of socks.

Cloth was the expensive part

In Edo-period Japan (1603-1867) sumptuary laws reserved fine silk and good cotton for the upper classes. Everyone else wore what they could weave. In the far north, in Tohoku, the problem was worse than social: cotton does not grow well in that climate. Households there spun hemp and ramie, fibres that are strong but cold, and cotton arrived only as traded scraps carried north by boat and cart.

So a piece of cotton, once it entered a house, stayed. It was patched into a jacket, and when the jacket failed it went into a work coat, and then into a futon cover, and then into rags for the baby. Some surviving pieces carry cloth from four or five generations in the same object.

Boro: the cloth that was never thrown away

The word boro (襤褬) comes from boroboro, meaning tattered or falling apart. It was not a compliment. These were the clothes of people who had nothing else, and after the Meiji period, as Japan modernised, families threw them out precisely because they were evidence of poverty.

What survives does so largely because of collectors who went looking before the last pieces disappeared. The folklorist Chuzaburo Tanaka gathered more than 20,000 boro items over his lifetime; 786 of them were designated Important Tangible Folk Cultural Properties, which is to say the Japanese state now classifies a farmer's patched rags as national heritage.

The aesthetic appeal came later and from outside. A boro futon cover is an accidental composition: dozens of indigo fragments of different ages and different fade levels, laid over each other in the order they were needed. Nobody designed it. That is exactly why it looks the way it does.

Sashiko: little stabs

Sashiko (刺し子) means roughly "little stabs". It is a running stitch, the simplest stitch there is, worked in a thick white cotton thread on indigo cloth. It does three jobs at once: it holds a patch down, it reinforces fabric that has grown thin, and it traps air between layers, which in an unheated northern house is not a small thing.

Two families of stitching developed. Moyozashi runs long lines of stitches that build up curves and geometric figures: seigaiha (breaking waves), uroko (fish scales), asanoha (hemp leaf). Hitomezashi works one stitch at a time on a grid, so the pattern appears only when the rows cross each other.

Regional traditions diverged sharply. Tsugaru, in Aomori, produced kogin-zashi, dense white counted stitching on indigo. Nanbu, on the other side of the same prefecture, produced hishi-zashi, built on diamonds. In the fishing communities of Shimokita the stitching was packed tight enough to stiffen a jacket against wind and salt. In Shonai it was worked in strict directional rows. You can locate a piece geographically by the way it was sewn.

Sashiko thread is not embroidery floss

One practical detail that trips up beginners. Western embroidery thread is stranded: six loose strands you separate. Sashiko thread is twisted into a single firm cord and used whole. It sits on the surface of the cloth instead of sinking into it, which is what gives sashiko its particular dotted, raised line. A sashiko needle is also longer than a standard sharp, because the technique is to load several stitches onto the needle and push them through in one movement rather than stitching one at a time.

Which brings us to socks

Socks are the most heavily worn thing most people own. They fail in three predictable places: the heel, the ball of the foot, and, on a tabi sock, the crotch of the split where the two toe chambers meet and the fabric is under constant tension from the sandal thong.

Darning, the European answer, rebuilds the missing fabric by weaving a new patch in the hole. Sashiko does something different and, on knitted cotton, often better: it backs the thin area with a piece of woven cloth and quilts through both layers, spreading the load instead of replacing it. The repair is visible. That is the point.

Mending a sock with sashiko, step by step

Allow half an hour for a first attempt. What you need: sashiko thread or any firm cotton thread, a long needle, a scrap of plain cotton slightly larger than the worn area, and something smooth to stretch the sock over. A darning mushroom is ideal; a small lightbulb, an orange or a smooth stone works.

1. Stretch the sock. Put the mushroom inside, worn area over the dome, and hold the sock snug but not pulled out of shape. A repair stitched on a stretched sock will pucker when it relaxes, so aim for its natural tension.

2. Cut the patch. Plain cotton, one to two centimetres larger than the thin area on every side. Round the corners. Corners are what lift and catch first.

3. Place it inside, not outside. For a sock this matters: an inside patch presents a smooth face to the shoe and keeps the stitching on the outside where it can be seen and, if needed, redone.

4. Anchor without a knot. Run the needle through the fabric a couple of centimetres away from the patch and leave a short tail, or take two tiny backstitches. A knot inside a sock becomes a pressure point under the foot.

5. Stitch in straight rows across the whole area. Not around the hole: across it, edge to edge, and one row beyond the patch on each side so the repair anchors into sound fabric. Load three or four stitches on the needle, then pull through. Keep the rows parallel and evenly spaced, roughly three to four millimetres between stitches.

6. Turn ninety degrees if you want a grid. A second set of rows crossing the first gives hitomezashi's grid and roughly doubles the reinforcement. On a heel, which takes the most abrasion, it is worth it.

7. Finish loose. Run the thread back under the last few stitches and cut. Do not pull anything tight. A sashiko repair should flex with the knit.

On a tabi sock, work the split seam differently: stitch two short parallel rows either side of the seam rather than across it, so the split can still open. Stitching over the seam will make the sock fight the sandal thong.

Mottainai, and the fashion version

The word usually attached to all this is mottainai, an expression of regret at waste that predates any sustainability campaign by several centuries. It is worth separating from the current market in boro-look clothing, where a new garment is manufactured pre-patched and sold at a premium. That is a style quotation, and there is nothing wrong with it, but it is the opposite operation: boro was what happened when nothing could be discarded, and its beauty is a by-product of an accounting problem.

The useful inheritance is not the look. It is the assumption that a worn garment is a thing to be worked on rather than replaced, which is a reasonable attitude to bring to a good pair of Japanese socks that has developed a thin patch after two years.

If you would rather not get to the mending stage, most of it is avoidable: our guide to caring for Japanese cotton socks covers washing temperature and drying, which is where most premature wear comes from. For the wider context of where these fabrics and dyes come from, see indigo dyeing in Japan and Japanese textile traditions. And if you want socks that carry these motifs rather than repair them, the patterns in our wa collection come from the same visual vocabulary.