GU to Boden clothing size

The short answer

GU XL is Boden 8 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 Boden. Letter sizes on the left, US on the right.
GU Japan sizing	GU builds it for	Boden, by chart	Same label	Boden builds it for	Boden 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	2	not published	bust 32 to 33 in, waist 25 to 26 in, hip 34 to 35 in	Letter XS
M	bust 31.5 to 33.5 in, waist 24.8 to 26.4 in, hip 33.5 to 35 in	2	not published	bust 32 to 33 in, waist 25 to 26 in, hip 34 to 35 in	Letter XS
L	bust 33.5 to 35.4 in, waist 26.4 to 28 in, hip 35 to 36.6 in	6	not published	bust 34.3 to 35 in, waist 27.3 to 28 in, hip 36.3 to 37 in	Letter S
XL	bust 35.4 to 37.8 in, waist 28 to 30.3 in, hip 36.6 to 38.6 in	8	not published	bust 35.5 to 37 in, waist 28.5 to 30 in, hip 37.5 to 39 in	Letter M
XXL	bust 37.8 to 40.2 in, waist 30.3 to 32.7 in, hip 38.6 to 40.6 in	10	not published	bust 37.5 to 39 in, waist 30.5 to 32 in, hip 39.5 to 41 in	Letter M
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 41.5 to 43 in, waist 34.5 to 36 in, hip 43.5 to 45 in	Letter L

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

Boden to GU