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Athleta to Sweaty Betty leggings size

The short answer

Athleta XXS is Sweaty Betty XS or XXS by the two brands' own charts. 2 of 6 Athleta sizes land on a different label at Sweaty Betty.

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 Sweaty Betty. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
XXSwaist 24.3 in, hip 34 inXS or XXSXXSwaist 25 in, hip 36 inUS numeric 4
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXS or SXSwaist 25 in, hip 36 inUS numeric 4
Swaist 27.3 to 28.3 in, hip 37 to 38 inS or MSwaist 27 in, hip 38 inUS numeric 6
Mwaist 29.3 to 30.3 in, hip 39 to 40 inM or LMwaist 29 in, hip 40 inUS numeric 8
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inXLLwaist 33 in, hip 44 inUS numeric 12
XLwaist 34.3 in, hip 44.5 inXL or XXLXLwaist 33 in, hip 44 inUS numeric 12
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 Sweaty Betty 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

Sweaty Betty to Athleta