Gap to lululemon size

The short answer

Gap L is lululemon XL by the two brands' own charts. 4 of 7 Gap sizes land on a different label at lululemon.

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

Every Gap size read across to lululemon. Letter sizes on the left, Letter on the right.
Gap	Gap builds it for	lululemon, by chart	Same label	lululemon builds it for	lululemon also prints
XS	chest 35 to 36 in, neck 13.5 to 14 in, sleeve 31 to 32 in	XS	XS	chest 35 to 36 in	not published
S	chest 37 to 38 in, neck 14 to 14.5 in, sleeve 32 to 33 in	S	S	chest 37 to 38 in	not published
M	chest 39 to 41 in, neck 15 to 15.5 in, sleeve 33 to 34 in	M	M	chest 39 to 40 in	not published
L	chest 42 to 44 in, neck 16 to 16.5 in, sleeve 34 to 35 in	XL	L	chest 43 to 45 in	not published
XL	chest 45 to 48 in, neck 17 to 17.5 in, sleeve 35 to 35.5 in	XXL	XL	chest 46 to 48 in	not published
XXL	chest 49 to 52 in, neck 18 to 18.5 in, sleeve 35.5 to 36 in	3XL	XXL	chest 50 to 52 in	not published
XXXL	chest 55 in, neck 18.8 in, sleeve 36.5 in	4XL	3XL	chest 53 to 55 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

Gap size guide, read on 2026-09-18. Gap on TrueToSize
lululemon size guide, read on 2026-09-18. lululemon on TrueToSize

lululemon to Gap