DESCENTE to Gap clothing size

The short answer

DESCENTE O is Gap 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 DESCENTE Japan sizing size read across to Gap. Letter sizes on the left, US on the right.
DESCENTE Japan sizing	DESCENTE builds it for	Gap, by chart	Same label	Gap builds it for	Gap also prints
S	bust 30.7 to 32.3 in, waist 23.2 to 24.8 in	00	not published	bust 31.3 in, waist 24.8 in, hip 34.3 in	Letter XXS
M	bust 31.9 to 33.5 in, waist 24.4 to 26 in	0 or 2	not published	bust 32.3 in, waist 25.5 in, hip 35.3 in	Letter XS
L	bust 33.1 to 34.7 in, waist 25.6 to 27.2 in	4 or 2	not published	bust 34.3 in, waist 27.5 in, hip 37.3 in	Letter S
O	bust 34.3 to 35.8 in, waist 26.8 to 28.4 in	6	not published	bust 35.3 in, waist 28.5 in, hip 38.3 in	Letter S
XO	bust 35.4 to 37 in, waist 28 to 29.5 in	8	not published	bust 36.3 in, waist 29.5 in, hip 39.3 in	Letter M
2XO(XA)	bust 36.6 to 38.2 in, waist 29.1 to 30.7 in	10	not published	bust 37.3 in, waist 30.5 in, hip 40.3 in	Letter M

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

DESCENTE Japan sizing size guide, read on 2026-09-25.
Gap size guide, read on 2026-09-18. Gap on TrueToSize

Gap to DESCENTE