Koromogae: The Day a Whole Country Changes Its Clothes

Nara, November: the ancient capital's school children in winter uniform, ginkgo leaves marking the season underfoot — koromogae visible in the oldest city in Japan.

How a 1,200-year-old Japanese custom reveals something profound about a country you thought you already knew.

On June 1st, something happens in Japan that would be utterly impossible in America, Britain, or Australia. An entire country changes its clothes. Not gradually, not approximately — all at once, on the same day. Schoolchildren, salarymen, department store mannequins, Coca-Cola delivery men. One hundred and twenty-five million people, all making the same move, all at the same time.

In the US, you couldn't get a majority of people to agree that the sky is blue, much less persuade them to change their wardrobes on a specific date. Japan does it twice a year, voluntarily, because the culture holds.

This national ritual is called koromogae (衣替え) — Japan's ancient, still-vibrant tradition of the seasonal changing of clothes. And once you understand it, you see Japan differently.

You're standing on a Tokyo street corner in early June and you notice something that you can't quite put your finger on. The salarymen emerging from the subway look lighter, brighter somehow. The schoolchildren filing past the shrine gates wear different uniforms from the ones they wore last week. The department store windows have undergone an overnight transformation.

High school girls in crisp summer whites, the city's green canopy overhead, June announced not by the calendar but by what everyone is wearing.

You aren't imagining things. In western culture, when the weather warms, we move the puffy coats to the back of the closet without thinking much about it. In Japan, the changing of seasons is a formal transformation of attire — a collective, culturally sanctioned ritual performed on two specific dates each year.

On June 1st, summer clothing comes out. On October 1st, lighter clothing is folded away and the heavier fabrics return. Schools make the switch en masse. Government offices circulate memos collectively mandating the change. Companies send their employees the same message. Families pull cedar-scented boxes from storage and reinstate the wardrobe of the coming season.

The June date aligns with the onset of tsuyu, Japan's rainy season, when humidity makes proper wool and silk storage a practical necessity as much as a ritualized one.

The private heart of koromogae: a winter kimono folded into washi paper for summer storage — cedar-scented, carefully laundered, set aside until October calls it back

A Thousand Years of Changing with the Seasons

Koromogae reaches back to the Heian period (794–1185), imported from China as part of that era's rich cultural exchange. At the imperial court, nobles changed not merely their clothing but their entire color palettes, textile weights, and accessories — swapping bamboo fans for formal cypress ones as the season turned. Originally, the practice took place as many as five times a year.

The same ceremonial textile spanning two centuries: a Heian court illustration documenting the imperial koromogae at the Seiryōden — the red and black pattern unchanged from the 9th century to the present day.

Palace conservators install seasonal ceremonial textiles at the Seiryōden, Kyoto Imperial Palace — a tradition unbroken since the Heian period.

By the Edo period, the Tokugawa Shogunate had codified koromogae to four changes for the samurai class. Ordinary people quietly adopted the ritual as their own. Then in 1873, Meiji modernization streamlined it to twice a year — June and October — a pattern that remains today. A custom that began in silk-draped palace chambers now plays out in high school locker rooms and corporate HR memos across the country.

More Than Clothes

But koromogae is not just about changing clothes. On a deeper level, the Japanese people are a nation that has always valued the seasons immensely.

Even the tea ceremony speaks the season's language: Left: a light summer kimono with bold peonies, Right: a heavy autumn silk with restrained florals — and an iron kama (pot) reserved for cooler months.

In tea ceremony, the kimono worn in September differs from October's — not just in warmth but in motif, textile, the invisible grammar of appropriateness. The utensils, the hanging scroll, the flower in the vase all shift with the season. Koromogae reflects this same sensibility applied to daily life.

The patient visitor learns to read what the host is wearing — the fabric weight, the motif, the obi — before the first bowl of tea is served.

There's a word for this in Japanese aesthetics: Ma (間) — the meaningful pause, the space between things. Koromogae is a kind of calendared Ma, a deliberate pause in which all people participate in the turning of the year rather than merely living through it.

The deliberate care of koromogae: a conservator ties ceremonial textiles at the Kyoto Imperial Palace. The same knot, tied the same way, on the same date — for over a thousand years.

How to See It When You're There

Koromogae doesn't appear on any tourist itinerary. But once you know it exists, you'll find it everywhere.

Travel in late May or late September and you'll see the preparation — department stores revamping displays, dry cleaners impossibly busy. Arrive in early June or early October and you'll witness the switch itself, playing out simultaneously in every school corridor and office building.

On June 1st, an entire nation changes — not just its clothes. This Tokyo vending machine worker is quietly swapping winter hot drinks for cold ones. Japan simply turns the page.

The same attentiveness extends further than you might expect. Notice the vending machines as June approaches: the rows of hot canned coffee and warm green tea that sustained the city through winter quietly disappear, replaced almost overnight by cold drinks and chilled teas.

Seasonal limited means that Japan's Kit Kats change with the calendar — here for a moment, gone when the season turns.

And those Kit Kat flavors you spotted last October? Gone. Japan's seasonal Kit Kats are koromogae in a wrapper — here for their moment, then folded away until the season calls them back. Nobody announces it. It simply happens. Japan takes its seasons seriously — and once you start looking, you'll find koromogae everywhere.

Have you witnessed examples of koromogae during your travels? If so, drop us a note.

Picture Sources:

Dreamstime ID 455953085 © Ijordan977 / Dreamstime.com — Vending machine restocking, Tokyo

Dreamstime ID 390231148 © HELLOUG / Dreamstime.com — High school girls in summer uniforms

© Candy Candy / Shutterstock (ID 2572862811) — Woman folding red kimono

Kyoto Imperial Palace photographs courtesy of the Imperial Household Agency — kyoto-gosho.kunaicho.go.jp

Dreamstime ID 365749169 © Artem Bolshakov / Dreamstime.com — Summer kimono tea ceremony

Dreamstime ID 132789406 © Dmytro Tolmachov / Dreamstime.com — Winter kimono tea ceremony

Dreamstime ID 14436391 © Cenk Unver / Dreamstime.com — Tea ceremony, maroon kimono

Dreamstime ID 45572536 © Bidouze Stephane / Dreamstime.com — Nara schoolchildren in winter uniforms