Is Japanese clothing smaller than US clothing?

Often yes for the same letter label. Japanese cuts also tend to be slimmer, so body measurements are more reliable than letters alone.

Should I trust this table over a brand size chart?

No. This page is a generic planning reference. Always use the brand official chart when it is available.

Japanese to US Clothing Size Guide

Letter-size reference for tops and casual wear, plus a calculator from your body measurements. Chart last updated: 2026-04-05.

Japanese labels on tags often run smaller than US vanity sizing. Use brand charts when available; this table is a generic planning reference aligned with common international tops guidance.

Women: JP label → US hint

JP	US letter	US numeric hint
S	XS	0–2
M	S	4–6
L	M	8–10
XL	L	12–14
XXL	XL	16–18

Men: JP label → US hint

JP	US hint	Chest size hint
S	XS–S	34–36
M	S–M	38–40
L	M–L	42–44
XL	L–XL	46–48
XXL	XL–XXL	50+

Women: JP label → US hint

Men: JP label → US hint

Japanese to US Clothing FAQ