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Fabletics to Athleta leggings size

The short answer

Fabletics XXL/1X is Athleta 1X by the two brands' own charts. 5 of 12 Fabletics 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 Fabletics size read across to Athleta. Letter sizes on the left, Letter on the right.
FableticsFabletics builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
XXSwaist 24 to 25 in, hip 33 to 35 inXXSXXSwaist 24.3 in, hip 34 inUS numeric 00
XSwaist 25.5 to 26.5 in, hip 36 to 37 inXSXSwaist 25.3 to 26.3 in, hip 35 to 36 inUS numeric 0-2
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 27.3 to 28.3 in, hip 37 to 38 inUS numeric 4-6
Mwaist 29 to 31 in, hip 39 to 41 inMMwaist 29.3 to 30.3 in, hip 39 to 40 inUS numeric 8-10
Lwaist 32 to 34 in, hip 42 to 44 inLLwaist 31.8 to 33.3 in, hip 41.5 to 43 inUS numeric 12-14
XLwaist 35 to 37 in, hip 45 to 47 inXL or 1XXLwaist 34.3 in, hip 44.5 inUS numeric 16-18
XXL/1Xwaist 38 to 41 in, hip 48 to 51 in1Xnot publishedwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
2Xwaist 41 to 43 in, hip 51 to 53 in2X2Xwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
3Xwaist 43 to 45 in, hip 53 to 55 in2X3Xwaist 42 to 44.5 in, hip 51.3 to 53.8 inUS numeric 20W-22W
4Xwaist 45 to 47 in, hip 55 to 57 in3X or 2Xnot publishedwaist 47 to 49.5 in, hip 56.3 to 58.8 inUS numeric 24W-26W
5Xwaist 47 to 49 in, hip 57 to 59 in3Xnot publishedwaist 47 to 49.5 in, hip 56.3 to 58.8 inUS numeric 24W-26W
6Xwaist 49 to 51 in, hip 59 to 61 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 Fabletics