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Athleta to Gymshark leggings size

The short answer

Athleta M is Gymshark M by the two brands' own charts. 0 of 6 Athleta sizes land on a different label at Gymshark.

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 Gymshark. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forGymshark, by chartSame labelGymshark builds it forGymshark also prints
XXSwaist 24.3 in, hip 34 inXXSXXSwaist 24 in, hip 35.5 inUS numeric 2-4
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXSXSwaist 26 in, hip 37.5 inUS numeric 4-6
Swaist 27.3 to 28.3 in, hip 37 to 38 inSSwaist 28 in, hip 39.5 inUS numeric 6-8
Mwaist 29.3 to 30.3 in, hip 39 to 40 inMMwaist 30 in, hip 41.5 inUS numeric 8-10
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inLLwaist 32 in, hip 43.5 inUS numeric 10-12
XLwaist 34.3 in, hip 44.5 inXLXLwaist 34 in, hip 45.5 inUS numeric 12-14
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 Gymshark 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

Gymshark to Athleta