Size Guide — Koisea Japanese Streetwear
Koisea Size Guide
Find your fit
Real measurements for every Koisea category — jackets, tees, hoodies, polos, sweatshirts and kids.
Size charts
Measurements by category
Measurements are taken flat from the garment and may vary slightly by style. If you're unsure, message us before ordering.
How to measure
Measure a piece you love
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1ChestLay the garment flat and measure across, armpit to armpit. For your body, measure around the fullest part of the chest under the arms.
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2LengthFrom the highest point of the shoulder (next to the collar) straight down to the hem.
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3ShoulderAcross the back, from one shoulder seam to the other.
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4SleeveFrom the shoulder seam down to the end of the cuff.
Our charts list chest, sleeve, length (where available) and a suggested height range. Shoulder isn't listed on our charts — message us if you need it for a specific item.
Fit tips
Getting it right
Size up 1–2
Asian sizing runs small. If you're a US M, start by looking at L or XL.
Compare a favourite
Measure a jacket or tee that fits you well and match it to the chart.
Ask before ordering
Measurements can vary slightly by style. Not sure? Send us a message and we'll help you choose.
Between sizes?
Choose the larger size for layering or a relaxed sukajan look.
FAQ
Sizing questions
Do Koisea items run small?
Yes. Koisea styles use Asian sizing, which is 1–2 sizes smaller than standard US/EU sizes. Compare your measurements with the chart before ordering.
What if I'm not sure about my size?
Compare your measurements with the charts on this page, or send us a message before ordering and we'll help you choose.
Are the measurements body or garment measurements?
They are garment measurements, so compare them with a piece of clothing that fits you well.
Can I return an item if it doesn't fit?
Returns are accepted within 30 days for unworn, unwashed items with tags and original packaging. Customer return shipping applies. See our Shipping & Returns page.
Does Buy 3 Get 1 Free work with any size?
Yes — mix and match sizes across eligible categories. Add 4 eligible items and the lowest-priced one is free.