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SKIMS to Athleta leggings size

The short answer

SKIMS XL is Athleta 1X or XL by the two brands' own charts. 4 of 9 SKIMS sizes land on a different label at Athleta.

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

Every SKIMS size read across to Athleta. Letter sizes on the left, Letter on the right.
SKIMSSKIMS builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
XXSwaist 23 to 24 in, hip 31 to 34 inXXSXXSwaist 24.3 in, hip 34 inUS numeric 00
XSwaist 24 to 26 in, hip 34 to 36.5 inXSXSwaist 25.3 to 26.3 in, hip 35 to 36 inUS numeric 0-2
Swaist 26.5 to 28.5 in, hip 37 to 39 inSSwaist 27.3 to 28.3 in, hip 37 to 38 inUS numeric 4-6
Mwaist 29 to 31 in, hip 39.5 to 41.5 inMMwaist 29.3 to 30.3 in, hip 39 to 40 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 42 to 44 inLLwaist 31.8 to 33.3 in, hip 41.5 to 43 inUS numeric 12-14
XLwaist 35 to 38 in, hip 44.5 to 47.5 in1X or XLXLwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
2Xwaist 38.5 to 41.5 in, hip 48 to 51 in1X2Xwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
3Xwaist 42 to 45.5 in, hip 51.5 to 55 in2X3Xwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
4Xwaist 46 to 49.5 in, hip 55.5 to 59 in3Xnot publishedwaist 47 to 49.5 in, hip 56.3 to 58.8 inUS numeric 24W-26W
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

Athleta to SKIMS