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Old Navy to Gap size

The short answer

Old Navy L is Gap XL by the two brands' own charts. 2 of 7 Old Navy 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 Old Navy size read across to Gap. Letter sizes on the left, Letter on the right.
Old NavyOld Navy builds it forGap, by chartSame labelGap builds it forGap also prints
XSchest 36 to 37 in, neck 13 to 13.5 in, sleeve 31.5 to 32 inXS or SXSchest 35 to 36 in, neck 13.5 to 14 in, sleeve 31 to 32 innot published
Schest 38 to 39 in, neck 14 to 14.5 in, sleeve 32.5 to 33 inS or MSchest 37 to 38 in, neck 14 to 14.5 in, sleeve 32 to 33 innot published
Mchest 40 to 42 in, neck 15 to 15.5 in, sleeve 33.5 to 34 inMMchest 39 to 41 in, neck 15 to 15.5 in, sleeve 33 to 34 innot published
Lchest 44 to 46 in, neck 16 to 16.5 in, sleeve 34.5 to 35 inXLLchest 45 to 48 in, neck 17 to 17.5 in, sleeve 35 to 35.5 innot published
XLchest 48 to 50 in, neck 17 to 17.5 in, sleeve 35.5 to 36 inXXLXLchest 49 to 52 in, neck 18 to 18.5 in, sleeve 35.5 to 36 innot published
XXLchest 51 to 53 in, neck 18 to 18.5 in, sleeve 36.5 to 37 inXXLXXLchest 49 to 52 in, neck 18 to 18.5 in, sleeve 35.5 to 36 innot published
XXXLchest 55 to 57 in, neck 19 to 19.5 in, sleeve 37.5 to 38 inXXXLXXXLchest 55 in, neck 18.8 in, sleeve 36.5 innot published
XXXXLchest 58 to 60 in, neck 20.5 to 21 in, sleeve 38.5 to 39 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 1 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 Old Navy