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Old Navy to MUJI size

The short answer

Old Navy XS is MUJI M by the two brands' own charts. 5 of 5 Old Navy 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.

On 4 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Old Navy size read across to MUJI Japan sizing. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forMUJI Japan sizing, by chartSame labelMUJI builds it forMUJI also prints
XSchest 36 to 37 in, neck 13 to 13.5 in, sleeve 31.5 to 32 inMXSchest 34.7 to 37.8 in, waist 29.9 to 33.1 in, hip 35.4 to 38.6 innot published
Schest 38 to 39 in, neck 14 to 14.5 in, sleeve 32.5 to 33 inLSchest 37.8 to 40.9 in, waist 33.1 to 36.2 in, hip 38.6 to 41.7 innot published
Mchest 40 to 42 in, neck 15 to 15.5 in, sleeve 33.5 to 34 inXLMchest 40.9 to 44.1 in, waist 36.2 to 39.4 in, hip 41.7 to 44.9 innot published
Lchest 44 to 46 in, neck 16 to 16.5 in, sleeve 34.5 to 35 inXXLLchest 44.1 to 47.2 in, waist 39.4 to 42.5 in, hip 44.9 to 48 innot published
XLchest 48 to 50 in, neck 17 to 17.5 in, sleeve 35.5 to 36 inXXLXLchest 44.1 to 47.2 in, waist 39.4 to 42.5 in, hip 44.9 to 48 innot published
XXLchest 51 to 53 in, neck 18 to 18.5 in, sleeve 36.5 to 37 innot madeXXLnot publishednot published
XXXLchest 55 to 57 in, neck 19 to 19.5 in, sleeve 37.5 to 38 innot madenot publishednot publishednot published
XXXXLchest 58 to 60 in, neck 20.5 to 21 in, sleeve 38.5 to 39 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 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 Old Navy