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Athleta to SET Active leggings size

The short answer

Athleta XXS is SET Active XS by the two brands' own charts. 4 of 7 Athleta sizes land on a different label at SET Active.

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 SET Active. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forSET Active, by chartSame labelSET Active builds it forSET Active also prints
XXSwaist 24.3 in, hip 34 inXSnot publishedwaist 22 to 24 inUS numeric 00-4
XSwaist 25.3 to 26.3 in, hip 35 to 36 inSXSwaist 25 to 27 inUS numeric 4-6
Swaist 27.3 to 28.3 in, hip 37 to 38 inMSwaist 28 to 30 inUS numeric 8-10
Mwaist 29.3 to 30.3 in, hip 39 to 40 inMMwaist 28 to 30 inUS numeric 8-10
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inLLwaist 31 to 33 inUS numeric 12-14
XLwaist 34.3 in, hip 44.5 inXLXLwaist 34 to 36 inUS numeric 16-18
1Xwaist 38 to 40 in, hip 47.3 to 49.3 inXXLnot publishedwaist 37 to 40 inUS numeric 20-22
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. 2 sizes have no counterpart on the SET Active 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

SET Active to Athleta