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Zella to Athleta leggings size

The short answer

Zella XXL is Athleta 1X by the two brands' own charts. 4 of 10 Zella sizes land on a different label at Athleta.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Zella size read across to Athleta. Letter sizes on the left, Letter on the right.
ZellaZella builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
XXSwaist 24 in, hip 33.5 inXXSXXSwaist 24.3 in, hip 34 inUS numeric 00
XSwaist 25 to 26 in, hip 34.5 to 35.5 inXSXSwaist 25.3 to 26.3 in, hip 35 to 36 inUS numeric 0-2
Swaist 27 to 28 in, hip 36.5 to 37.5 inSSwaist 27.3 to 28.3 in, hip 37 to 38 inUS numeric 4-6
Mwaist 29 to 30 in, hip 38.5 to 39.5 inMMwaist 29.3 to 30.3 in, hip 39 to 40 inUS numeric 8-10
Lwaist 31.5 to 33.5 in, hip 41.5 to 43.5 inLLwaist 31.8 to 33.3 in, hip 41.5 to 43 inUS numeric 12-14
XLwaist 35.5 in, hip 45.5 inXLXLwaist 34.3 in, hip 44.5 inUS numeric 16-18
XXLwaist 38 in, hip 48.5 in1Xnot publishedwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
2Xwaist 40.5 in, hip 51 in1X or 2X2Xwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
3Xwaist 43 to 45 in, hip 53.3 to 55.5 in2X3Xwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
4Xwaist 47 to 49 in, hip 57.8 to 60 in3Xnot publishedwaist 47 to 49.5 in, hip 56.3 to 58.8 inUS numeric 24W-26W
Tinted rows change label or sit between two sizes. 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

Athleta to Zella