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Athleta to Aerie (OFFLINE) leggings size

The short answer

Athleta XXS is Aerie (OFFLINE) XS by the two brands' own charts. 2 of 7 Athleta sizes land on a different label at Aerie (OFFLINE).

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 Aerie (OFFLINE). Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forAerie (OFFLINE), by chartSame labelAerie (OFFLINE) builds it forAerie (OFFLINE) also prints
XXSwaist 24.3 in, hip 34 inXSXXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXSXSwaist 24.5 to 25.5 in, hip 34 to 35 inUS numeric 0-2
Swaist 27.3 to 28.3 in, hip 37 to 38 inSSwaist 26.5 to 27.5 in, hip 36 to 37 inUS numeric 4-6
Mwaist 29.3 to 30.3 in, hip 39 to 40 inMMwaist 28.5 to 29.5 in, hip 38 to 39 inUS numeric 8-10
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inLLwaist 31 to 32.5 in, hip 40.5 to 42 inUS numeric 12-14
XLwaist 34.3 in, hip 44.5 inXLXLwaist 34 to 36 in, hip 43.5 to 45.5 inUS numeric 16-18
1Xwaist 38 to 40 in, hip 47.3 to 49.3 inXXLnot publishedwaist 38 in, hip 47.5 inUS numeric 20
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 Aerie (OFFLINE) 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

Aerie (OFFLINE) to Athleta