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Athleta to Old Navy leggings size

The short answer

Athleta XL is Old Navy L by the two brands' own charts. 2 of 9 Athleta sizes land on a different label at Old Navy.

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

Every Athleta size read across to Old Navy. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
XXSwaist 24.3 in, hip 34 inXXSXXSwaist 24 in, hip 34.5 inUS numeric 00
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXSXSwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
Swaist 27.3 to 28.3 in, hip 37 to 38 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29.3 to 30.3 in, hip 39 to 40 inMMwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inLLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34.3 in, hip 44.5 inLXLwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
1Xwaist 38 to 40 in, hip 47.3 to 49.3 inXLnot publishedwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
2Xwaist 42 to 44.5 in, hip 51.3 to 53.8 in2X2Xwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS numeric 20-22
3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 in3X3Xwaist 46.6 to 49 in, hip 56.1 to 58.5 inUS numeric 24-26
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. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Old Navy to Athleta