GU to J.Crew clothing size

The short answer

GU XL is J.Crew 8 or 6 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 GU Japan sizing size read across to J.Crew. Letter sizes on the left, US on the right.
GU Japan sizing	GU builds it for	J.Crew, by chart	Same label	J.Crew builds it for	J.Crew also prints
XS	bust 27.6 to 29.5 in, waist 21.3 to 23.2 in, hip 30.3 to 31.9 in	not made	not published	not published	not published
S	bust 29.5 to 31.5 in, waist 23.2 to 24.8 in, hip 31.9 to 33.5 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 33.5 in, waist 24.8 to 26.4 in, hip 33.5 to 35 in	00 or 0	not published	bust 32 in, waist 24 in	Letter XXS · UK 2 · DE 26 · FR 30 · IT 34 · AU 2 · JP 1
L	bust 33.5 to 35.4 in, waist 26.4 to 28 in, hip 35 to 36.6 in	2 or 4	not published	bust 34 in, waist 26 in	Letter XS · UK 6 · DE 30 · FR 34 · IT 38 · AU 6 · JP 5
XL	bust 35.4 to 37.8 in, waist 28 to 30.3 in, hip 36.6 to 38.6 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 37.8 to 40.2 in, waist 30.3 to 32.7 in, hip 38.6 to 40.6 in	12	not published	bust 39.5 in, waist 31.5 in	Letter L · UK 16 · DE 40 · FR 44 · IT 48 · AU 16 · JP 15
3XL	bust 40.2 to 43.3 in, waist 32.7 to 35.4 in, hip 40.6 to 43.3 in	14	not published	bust 41 in, waist 33 in	Letter L · UK 18 · DE 42 · FR 46 · IT 50 · AU 18 · JP 17

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

GU Japan sizing size guide, read on 2026-09-25.
J.Crew size guide, read on 2026-09-18.

J.Crew to GU