GU to Sandro clothing size

The short answer

GU L is Sandro 36 or 38 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 Sandro. Letter sizes on the left, FR on the right.
GU Japan sizing	GU builds it for	Sandro, by chart	Same label	Sandro builds it for	Sandro 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	34	not published	bust 32 in, waist 25 in, hip 35 in	US 2 · Letter XS · UK 6 · DE 32 · IT 38
M	bust 31.5 to 33.5 in, waist 24.8 to 26.4 in, hip 33.5 to 35 in	34	not published	bust 32 in, waist 25 in, hip 35 in	US 2 · Letter XS · UK 6 · DE 32 · IT 38
L	bust 33.5 to 35.4 in, waist 26.4 to 28 in, hip 35 to 36.6 in	36 or 38	not published	bust 34 in, waist 27 in, hip 36 in	US 4 · Letter S · UK 8 · DE 34 · IT 40
XL	bust 35.4 to 37.8 in, waist 28 to 30.3 in, hip 36.6 to 38.6 in	40	not published	bust 37 in, waist 30 in, hip 39 in	US 8 · Letter L · UK 12 · DE 38 · IT 44
XXL	bust 37.8 to 40.2 in, waist 30.3 to 32.7 in, hip 38.6 to 40.6 in	42	not published	bust 39 in, waist 31 in, hip 41 in	US 10 · Letter XL · UK 14 · DE 40 · IT 46
3XL	bust 40.2 to 43.3 in, waist 32.7 to 35.4 in, hip 40.6 to 43.3 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Sandro 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.
Sandro size guide, read on 2026-09-18.

Sandro to GU