MUJI to J.Crew clothing size

The short answer

MUJI L is J.Crew 4 or 2 by the two brands' own charts.

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

Every MUJI Japan sizing size read across to J.Crew. Letter sizes on the left, US on the right.
MUJI Japan sizing	MUJI builds it for	J.Crew, by chart	Same label	J.Crew builds it for	J.Crew also prints
XS	bust 28.7 to 30.3 in, waist 22.1 to 23.6 in, hip 31.9 to 33.5 in	not made	not published	not published	not published
S	bust 29.5 to 31.9 in, waist 22.8 to 25.2 in, hip 32.7 to 35 in	000	not published	bust 31 in, waist 23 in	Letter XXXS · UK 0 · DE 24 · FR 28 · IT 32 · AU 0 · JP 1
M	bust 31.5 to 33.9 in, waist 24.8 to 27.2 in, hip 34.7 to 37 in	0	not published	bust 33 in, waist 25 in	Letter XS · UK 4 · DE 28 · FR 32 · IT 36 · AU 4 · JP 3
L	bust 33.5 to 35.8 in, waist 26.8 to 29.1 in, hip 36.6 to 39 in	4 or 2	not published	bust 35 in, waist 27 in	Letter S · UK 8 · DE 34 · FR 36 · IT 40 · AU 8 · JP 7
XL	bust 35.4 to 37.8 in, waist 28.7 to 31.1 in, hip 38.6 to 40.9 in	8 or 6	not published	bust 37 in, waist 29 in	Letter M · UK 12 · DE 36 · FR 40 · IT 44 · AU 12 · JP 11
XXL	bust 37.4 to 39.8 in, waist 30.7 to 33.1 in, hip 40.6 to 42.9 in	10 or 12	not published	bust 38 in, waist 30 in	Letter M · UK 14 · DE 38 · FR 42 · IT 46 · AU 14 · JP 13

Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the J.Crew 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 Japan sizing size guide, read on 2026-09-25.
J.Crew size guide, read on 2026-09-18.

J.Crew to MUJI