Arc'teryx to Gap clothing size

The short answer

Arc'teryx L is Gap 14 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 Arc'teryx size read across to Gap. Letter sizes on the left, US on the right.
Arc'teryx	Arc'teryx builds it for	Gap, by chart	Same label	Gap builds it for	Gap also prints
XS	bust 33.1 in, waist 26.8 in, hip 36.2 in	2	not published	bust 33.3 in, waist 26.5 in, hip 36.3 in	Letter XS
S	bust 35 in, waist 28.7 in, hip 38.2 in	6	not published	bust 35.3 in, waist 28.5 in, hip 38.3 in	Letter S
M	bust 37 in, waist 30.7 in, hip 40.2 in	10	not published	bust 37.3 in, waist 30.5 in, hip 40.3 in	Letter M
L	bust 40.2 in, waist 33.9 in, hip 43.3 in	14	not published	bust 40.3 in, waist 33.5 in, hip 43.3 in	Letter L
XL	bust 44.1 in, waist 37.8 in, hip 47.2 in	18	not published	bust 43.8 in, waist 37.5 in, hip 47.3 in	Letter XL
XXL	bust 48 in, waist 41.7 in, hip 51.2 in	22	not published	bust 47.8 in, waist 41.5 in, hip 51.3 in	Letter XXL

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

Arc'teryx size guide, read on 2026-09-18.
Gap size guide, read on 2026-09-18. Gap on TrueToSize

Gap to Arc'teryx