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Nike to Gap size

The short answer

Nike S is Gap XS by the two brands' own charts. 2 of 7 Nike sizes land on a different label at Gap.

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

Every Nike size read across to Gap. Letter sizes on the left, Letter on the right.
NikeNike builds it forGap, by chartSame labelGap builds it forGap also prints
XXSchest 28.1 to 31.5 in, waist 22.5 to 25.5 in, hip 28.5 to 31.5 innot madenot publishednot publishednot published
XSchest 31.5 to 35 in, waist 25.5 to 29 in, hip 31.5 to 35 inXSXSchest 35 to 36 in, neck 13.5 to 14 in, sleeve 31 to 32 innot published
Schest 35 to 37.5 in, waist 29 to 32 in, hip 35 to 37.5 inXSSchest 35 to 36 in, neck 13.5 to 14 in, sleeve 31 to 32 innot published
Mchest 37.5 to 41 in, waist 32 to 35 in, hip 37.5 to 41 inMMchest 39 to 41 in, neck 15 to 15.5 in, sleeve 33 to 34 innot published
Lchest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 inLLchest 42 to 44 in, neck 16 to 16.5 in, sleeve 34 to 35 innot published
XLchest 44 to 48.5 in, waist 38 to 43 in, hip 44 to 47 inXLXLchest 45 to 48 in, neck 17 to 17.5 in, sleeve 35 to 35.5 innot published
XXLchest 48.5 to 53.5 in, waist 43 to 47.5 in, hip 47 to 50.5 inXXLXXLchest 49 to 52 in, neck 18 to 18.5 in, sleeve 35.5 to 36 innot published
3XLchest 53.5 to 58 in, waist 47.5 to 52.5 in, hip 50.5 to 53.5 inXXXLXXXLchest 55 in, neck 18.8 in, sleeve 36.5 innot published
4XLchest 58 to 63 in, waist 52.5 to 57 in, hip 53.5 to 58.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Gap 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

Gap to Nike