Children's kimono and the age fold

This guide is part of Komon Lab’s free MVP series. We do not sell patterns. We explain how the traditional system works so you can use any pattern — paper or PDF — with more confidence. Affiliate links, where present, are clearly marked at the foot of the page.

A children’s kimono has a problem that adult clothing does not. The wearer is going to be bigger in six months. Sometimes substantially bigger. And the kimono — made of valuable cloth, often passed down between siblings or across generations — is expected to fit for years, not weeks.

Western children’s clothing solves this by being cheap and replaceable. You buy size 4, then size 5, then size 6. The garment itself does not grow; you replace it. This works because Western clothes are mass-produced and (relatively) inexpensive, and because the design language tolerates last year’s clothes looking obviously last year.

Wasai solves it differently. The kimono is sewn at adult proportions — or close to them — and the excess is folded out as visible horizontal tucks at the shoulder and waist. As the child grows, the tucks are let out and re-sewn at smaller depths. By the time the child reaches adult size, the tucks are gone and the kimono is at full adult length. Same garment, multiple years of fit.

This is the age fold (age meaning “raise” or “fold up”). It is one of the most elegant pieces of structural thinking in wasai, and it is invisible to most viewers: the tuck just looks like a decorative horizontal seam.

This guide explains how the age fold works, where it goes, how to plan one when drafting a children’s pattern, and how to let it out when the time comes.

What the age fold is

The age fold is two horizontal tucks built into a children’s kimono:

The kataage (肩揚げ, “shoulder raise”) is a tuck across the upper shoulder area, taken in both the back and the front, that gathers excess length out of the body panels at the top of the garment.

The koshiage (腰揚げ, “waist raise”) is a tuck across the waist area that gathers excess length out of the body panels at the middle of the garment.

Together they remove the right amount of fabric from a full-adult-length garment to make it fit the child’s actual height and torso length.

The tucks are not hidden — they are visible as horizontal stitched lines across the kimono — but they are read as a normal feature of children’s wear, not as makeshift adjustments. A child’s kimono should have age folds. A child’s kimono without them looks oddly grown-up.

Where the folds go

Picture an adult-length kimono body panel laid flat. It is around 160 cm long (varies by wearer), with the shoulder at the top and the hem at the bottom. The wearer at adult size fills this length.

A six-year-old wearer needs perhaps 100 cm of length. The 60 cm of excess has to go somewhere, and it cannot go into the hem (hemming would mean cutting fabric, which defeats the purpose of growth allowance). So the excess is folded up at two places:

The shoulder fold takes perhaps 20-25 cm out at the top, just below the shoulder seam. This tuck pulls the sleeves up to the right height for the shorter child arm.

The waist fold takes the remaining 35-40 cm out at the waist, just below the obi line. This tuck pulls the hem up to the right length for the shorter child body.

Both folds are sewn flat as visible horizontal seams. The fabric does not move; it just is no longer counted in the visible length.

When the child grows by, say, 10 cm in a year, you unpick perhaps 5 cm from each tuck and re-sew at the smaller depth. The kimono visibly grows with the child, year by year, without ever cutting cloth.

Why it works

The age fold works because of three deep features of kimono construction.

First, the kimono is cut from rectangles. There are no curved seams, no darts, and no shaped pieces. A horizontal tuck across a rectangular body panel does not interfere with anything — there are no bust shaping seams to align with, no princess seams to cross, no waist shaping to disrupt. The tuck just removes length, full stop.

Second, the kimono is hand-sewn, which means seams can be unpicked cleanly. A machine-sewn lockstitch is genuinely difficult to unpick without damaging fabric. A hand-sewn running stitch comes out in seconds with no damage. The age fold is unpicked and re-sewn dozens of times over a kimono’s life; only hand-sewing makes that practical.

Third, kimono fabric is sized to be reusable. The decision to cut on straight lines and the decision to hand-sew are both responsive to the same underlying intent: fabric is precious, garments are long-term investments, and anything that lets cloth be re-cut, re-stitched, or passed down extends its life. The age fold is a children’s-clothing instance of the same logic that drives araihari (full disassembly for cleaning) in adult wear.

Drafting a children’s kimono with growth allowance

If you draft your own children’s pattern (the Komon Lab tool does not currently generate children’s patterns, but the method is straightforward), the process is:

Start from the child’s expected adult dimensions — typically the parent’s measurements as a proxy, or standard adult sizes adjusted for the child’s likely build. This is what the kimono will fit when fully let out.

Cut the body panels at adult length. Do not shorten for the child’s current size.

Sew the kimono together as you would for an adult, but stop before the final hem.

Measure the child’s current height, sleeve length, and torso length. Subtract from the adult dimensions to get the excess for each.

Distribute the excess between the kataage and the koshiage. A rough rule: about one-third of the body excess goes into the shoulder tuck, two-thirds into the waist tuck. Sleeve excess (for the shorter child arm) goes into a separate small tuck at the sleeve, called a sodeage (袖揚げ, “sleeve raise”).

Sew the tucks as visible horizontal seams across the body panels. The tuck is folded toward the inside (so the fold is hidden beneath the obi or sits flat against the body), and stitched in place along the visible horizontal line.

Hem the kimono at the now-correct length.

Each year, unpick a portion of each tuck and re-sew at a smaller depth. When the child reaches adult size, the tucks are fully let out and the kimono fits at full length.

Common children’s kimono contexts

The most visible setting for children’s kimono in modern Japan is shichi-go-san (七五三, “seven-five-three”), a Shinto ceremony for children at ages three, five, and seven. Boys are celebrated at three and five; girls at three and seven. Children wear formal kimono with full obi and (often) decorative accessories, are photographed, and visit a shrine.

The kimono worn for shichi-go-san are typically:

At three: a simple formal kimono, often with a soft hifu vest worn over the top so the child doesn’t have to deal with an obi.

At five (boys): a formal black-and-grey kimono with hakama (split trousers) — the boy’s first time wearing hakama, which is the visual centre of the outfit.

At seven (girls): a full formal kimono with a real obi, tied in a structured knot. This is the girl’s first time wearing a “real” adult-style obi, and the obi knot is often elaborate.

All three are sewn with age folds. The seven-year-old’s outfit, in particular, is often passed down — a kimono first worn for a daughter’s shichi-go-san may be let out over the following years and worn again for everyday occasions through pre-teenage years.

Other contexts where children’s kimono with age folds appear: New Year, summer festivals (where children wear yukata, typically with age folds at the shoulder only), dance and tea ceremony classes, family weddings.

Practical notes on let-out and care

A few things to know if you are making or maintaining a children’s kimono.

Plan the maximum let-out at the start. The total tuck depth is the maximum amount the garment can grow. If you anticipate three years of wear before the child outgrows the maximum adult dimensions you cut to, plan tucks deep enough to let out gradually across those years.

Mark the tuck line clearly. When you sew the kataage and koshiage, the seam is a horizontal line at a specific height. When you re-sew at a smaller depth a year later, you need to know exactly where the new line should sit. A small permanent mark — a basted thread, a fabric pen on the inside, tailor’s chalk on a high-contrast lining — saves grief.

The fabric inside the tuck does not see daylight. This is generally good (no sun fading where the tuck is folded) but means there is sometimes a slight colour difference between the visible cloth and the let-out cloth. With high-quality silk this is usually invisible after a few wears. With cheaper synthetics it can be noticeable.

The tuck affects how the obi sits. The koshiage waist tuck is typically positioned so that the obi sits over the tuck, hiding the seam line. Plan the koshiage height in relation to where the obi will be worn, not at an arbitrary point.

Re-sewing the tuck is a five-minute job, but doing it crooked is visible for the next year. Take the time to baste with a fine running stitch — a long sashiko or kuke needle makes the basting fast — and check before sewing the final stitches.

Figures

What this guide does not cover

This guide explains the structural logic. It does not draft a full children’s pattern (Marshall and Dobson both cover this in detail), does not teach the precise stitch order for sewing kataage and koshiage (a wasai class is the practical path), and does not cover the formal accessories for shichi-go-san — zōri sandals, kanzashi hair ornaments, suehiro fans — each of which is its own short topic.

What it does is give you the principle: a children’s kimono is an adult kimono with deliberate excess folded out. The excess is the gift you give to next year’s body.

Related guides

• Reading a Traditional Kimono Cut Chart
• How to Measure for a Kimono
• Men’s Kimono Proportions and Differences
• Cleaning and Storing a Hand-Sewn Kimono

Last updated 2026-05-29. Komon Lab guides are free and released under CC-BY-4.0. If you used this guide for a project we would love to see it.