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American Eagle to Nike size

The short answer

American Eagle XS is Nike S by the two brands' own charts. 7 of 10 American Eagle sizes land on a different label at Nike.

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

Every American Eagle size read across to Nike. Letter sizes on the left, Letter on the right.
American EagleAmerican Eagle builds it forNike, by chartSame labelNike builds it forNike also prints
XSchest 35 to 36 in, neck 13.5 to 14 in, sleeve 31.5 inSXSchest 35 to 37.5 in, waist 29 to 32 in, hip 35 to 37.5 innot published
Schest 37 to 39 in, neck 14.5 to 15 in, sleeve 32.5 inMSchest 37.5 to 41 in, waist 32 to 35 in, hip 37.5 to 41 innot published
Mchest 40 to 42 in, neck 15 to 15.5 in, sleeve 33.5 inLMchest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 innot published
M TALLchest 40 to 42 in, neck 15 to 15.5 in, sleeve 34.5 inLnot publishedchest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 innot published
Lchest 43 to 45 in, neck 15.5 to 16 in, sleeve 34.5 inLLchest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 innot published
L TALLchest 43 to 45 in, neck 15.5 to 16 in, sleeve 35.5 inLnot publishedchest 41 to 44 in, waist 35 to 38 in, hip 41 to 44 innot published
XLchest 46 to 48 in, neck 16.5 to 17 in, sleeve 35.5 inXLXLchest 44 to 48.5 in, waist 38 to 43 in, hip 44 to 47 innot published
XL TALLchest 46 to 48 in, neck 16.5 to 17 in, sleeve 36.5 inXLnot publishedchest 44 to 48.5 in, waist 38 to 43 in, hip 44 to 47 innot published
XXLchest 49 to 51 in, neck 17 to 18 in, sleeve 36.5 inXXLXXLchest 48.5 to 53.5 in, waist 43 to 47.5 in, hip 47 to 50.5 innot published
XXXLchest 52 to 54 in, neck 18 to 19 in, sleeve 37 inXXL3XLchest 48.5 to 53.5 in, waist 43 to 47.5 in, hip 47 to 50.5 innot 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

Nike to American Eagle