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Nike to MUJI size

The short answer

Nike XXS is MUJI XS by the two brands' own charts. 6 of 7 Nike sizes land on a different label at MUJI.

Both brands publish the body chest each size is cut for, so every row matches a chest, not a letter.

Every Nike size read across to MUJI Japan sizing. Letter sizes on the left, Letter on the right.
NikeNike builds it forMUJI Japan sizing, by chartSame labelMUJI builds it forMUJI also prints
XXSchest 28.1 to 31.5 in, waist 22.5 to 25.5 in, hip 28.5 to 31.5 inXSnot publishedchest 29.9 to 33.1 in, waist 25.2 to 28.4 in, hip 30.7 to 33.9 innot published
XSchest 31.5 to 35 in, waist 25.5 to 29 in, hip 31.5 to 35 inSXSchest 31.5 to 34.7 in, waist 26.8 to 29.9 in, hip 32.3 to 35.4 innot published
Schest 35 to 37.5 in, waist 29 to 32 in, hip 35 to 37.5 inMSchest 34.7 to 37.8 in, waist 29.9 to 33.1 in, hip 35.4 to 38.6 innot published
Mchest 37.5 to 41 in, waist 32 to 35 in, hip 37.5 to 41 inLMchest 37.8 to 40.9 in, waist 33.1 to 36.2 in, hip 38.6 to 41.7 innot published
Lchest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 inXLLchest 40.9 to 44.1 in, waist 36.2 to 39.4 in, hip 41.7 to 44.9 innot published
XLchest 44 to 48.5 in, waist 38 to 43 in, hip 44 to 47 inXXLXLchest 44.1 to 47.2 in, waist 39.4 to 42.5 in, hip 44.9 to 48 innot published
XXLchest 48.5 to 53.5 in, waist 43 to 47.5 in, hip 47 to 50.5 inXXLXXLchest 44.1 to 47.2 in, waist 39.4 to 42.5 in, hip 44.9 to 48 innot published
3XLchest 53.5 to 58 in, waist 47.5 to 52.5 in, hip 50.5 to 53.5 innot madenot publishednot publishednot published
4XLchest 58 to 63 in, waist 52.5 to 57 in, hip 53.5 to 58.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the MUJI chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

MUJI to Nike