Value Village ／ Everyday know-how
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Twice a year, Japanese households swap the contents of their wardrobes — winter clothes into storage, summer clothes out, and back again in autumn. Schools and offices used to switch uniforms on fixed dates. It looks like tradition; it is closet management for a small home.
| Step | Detail | Why |
|---|---|---|
| 1. Pick the day | Dry, sunny day, when temperatures have settled (late May/June; late September/October) | Store clothes dry |
| 2. Wash or clean everything going away | Even if it looks clean — sweat and skin oil are what moths eat and what yellows | Moth and stain prevention |
| 3. Dry completely | Air a full day; ironing is optional | Humidity is the enemy in storage |
| 4. Sort | Not worn this season → out (sell, give, recycle) | The main decluttering moment of the year |
| 5. Store | Breathable boxes or drawer units; moth repellent on top; desiccant at the bottom | Repellent vapour sinks; moisture sinks |
| 6. Rotate the closet | Off-season to the top shelf or under the bed; current season at eye level | Space |
[Verify] Cool Biz dates with the Ministry of the Environment; storage practices are widely shared conventions.
Those are institutional dates. Households go by the weather, and many now do it in three stages as autumns lengthen.
Invisible sweat and oil are what moths target and what turns yellow by autumn. Everything gets washed or cleaned first.
Good for cotton and synthetic bedding for a season; bad for down, wool and anything with loft, which lose resilience when compressed for months.
Repellent vapour is heavier than air — place it on top. Desiccant, which fights moisture that sinks, goes at the bottom.
It is a response to closet size. Anyone living in a small flat does a version of it; Japan just named it and built the storage products around it.
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https://ondankataisaku.env.go.jp/coolchoice/coolbiz/
https://www.caa.go.jp/policies/policy/representation/household_goods/laundry_symbols.html
https://www.jhpia.or.jp/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Always follow the instructions on any product you use, and never mix cleaning products. If you rent your home, check with your landlord before making any changes.
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