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Athleta to Uniqlo leggings size

The short answer

Athleta S is Uniqlo M by the two brands' own charts. 3 of 6 Athleta sizes land on a different label at Uniqlo.

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 Uniqlo. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forUniqlo, by chartSame labelUniqlo builds it forUniqlo also prints
XXSwaist 24.3 in, hip 34 inXXSXXSwaist 22.5 to 24.8 in, hip 32.8 to 35 innot published
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXSXSwaist 24 to 26.5 in, hip 34.3 to 36.5 innot published
Swaist 27.3 to 28.3 in, hip 37 to 38 inMSwaist 27.3 to 29.5 in, hip 37.5 to 39.8 innot published
Mwaist 29.3 to 30.3 in, hip 39 to 40 inLMwaist 29.5 to 32 in, hip 39.8 to 42.3 innot published
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inXLLwaist 32 to 34.3 in, hip 42.3 to 44.5 innot published
XLwaist 34.3 in, hip 44.5 inXLXLwaist 32 to 34.3 in, hip 42.3 to 44.5 innot published
1Xwaist 38 to 40 in, hip 47.3 to 49.3 innot madenot publishednot publishednot published
2Xwaist 42 to 44.5 in, hip 51.3 to 53.8 innot madenot publishednot publishednot published
3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Uniqlo chart. 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

Uniqlo to Athleta