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Decathlon to Athleta leggings size

The short answer

Decathlon 2XS is Athleta XXS by the two brands' own charts. 2 of 7 Decathlon 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 Decathlon size read across to Athleta. Letter sizes on the left, Letter on the right.
DecathlonDecathlon builds it forAthleta, by chartSame labelAthleta builds it forAthleta also prints
2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 inXXSXXSwaist 24.3 in, hip 34 inUS numeric 00
XSwaist 25.2 to 26.8 in, hip 33.5 to 35.4 inXSXSwaist 25.3 to 26.3 in, hip 35 to 36 inUS numeric 0-2
Swaist 27.2 to 28.7 in, hip 35.4 to 37.8 inSSwaist 27.3 to 28.3 in, hip 37 to 38 inUS numeric 4-6
Mwaist 29.1 to 31.1 in, hip 37.8 to 40.2 inMMwaist 29.3 to 30.3 in, hip 39 to 40 inUS numeric 8-10
Lwaist 31.5 to 33.9 in, hip 40.2 to 42.5 inLLwaist 31.8 to 33.3 in, hip 41.5 to 43 inUS numeric 12-14
XLwaist 34.3 to 36.6 in, hip 42.5 to 44.9 inXLXLwaist 34.3 in, hip 44.5 inUS numeric 16-18
2XLwaist 37 to 39.4 in, hip 44.9 to 47.2 in1Xnot publishedwaist 38 to 40 in, hip 47.3 to 49.3 inUS numeric 16W-18W
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 Decathlon