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Athleta to Fabletics leggings size

The short answer

Athleta XL is Fabletics L by the two brands' own charts. 4 of 9 Athleta sizes land on a different label at Fabletics.

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

On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Athleta size read across to Fabletics. Letter sizes on the left, Letter on the right.
AthletaAthleta builds it forFabletics, by chartSame labelFabletics builds it forFabletics also prints
XXSwaist 24.3 in, hip 34 inXXSXXSwaist 24 to 25 in, hip 33 to 35 inUS numeric 00
XSwaist 25.3 to 26.3 in, hip 35 to 36 inXSXSwaist 25.5 to 26.5 in, hip 36 to 37 inUS numeric 0-2
Swaist 27.3 to 28.3 in, hip 37 to 38 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29.3 to 30.3 in, hip 39 to 40 inMMwaist 29 to 31 in, hip 39 to 41 inUS numeric 8-10
Lwaist 31.8 to 33.3 in, hip 41.5 to 43 inLLwaist 32 to 34 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34.3 in, hip 44.5 inLXLwaist 32 to 34 in, hip 42 to 44 inUS numeric 12-14
1Xwaist 38 to 40 in, hip 47.3 to 49.3 inXXL/1XXXL/1Xwaist 38 to 41 in, hip 48 to 51 inUS numeric 16-18
2Xwaist 42 to 44.5 in, hip 51.3 to 53.8 in3X2Xwaist 43 to 45 in, hip 53 to 55 inUS numeric 24-26
3Xwaist 47 to 49.5 in, hip 56.3 to 58.8 in5X3Xwaist 47 to 49 in, hip 57 to 59 inUS numeric 32-34
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

Fabletics to Athleta