GU to Next size

The short answer

GU XS is Next XXS by the two brands' own charts. 7 of 7 GU sizes land on a different label at Next.

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

Every GU Japan sizing size read across to Next. Letter sizes on the left, Letter on the right.
GU Japan sizing	GU builds it for	Next, by chart	Same label	Next builds it for	Next also prints
XS	chest 29.9 to 33.1 in, waist 25.2 to 28.4 in	XXS	XS	chest 30 to 32 in	not published
S	chest 31.5 to 34.7 in, waist 26.8 to 29.9 in	XS	S	chest 33 to 35 in	not published
M	chest 34.7 to 37.8 in, waist 29.9 to 33.1 in	S	M	chest 36 to 38 in	not published
L	chest 37.8 to 40.9 in, waist 33.1 to 36.2 in	M	L	chest 39 to 41 in	not published
XL	chest 40.9 to 44.1 in, waist 36.2 to 39.4 in	L	XL	chest 42 to 44 in	not published
XXL	chest 44.1 to 47.2 in, waist 39.4 to 42.5 in	XL	2XL	chest 45 to 47 in	not published
3XL	chest 47.2 to 50.4 in, waist 42.5 to 45.7 in	2XL	3XL	chest 48 to 50 in	not published

Tinted rows change label or sit between two sizes. 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.
Next size guide, read on 2026-09-18.

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