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Adidas to Decathlon leggings size

The short answer

adidas XS is Decathlon 2XS by the two brands' own charts. 3 of 9 adidas sizes land on a different label at Decathlon.

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

Every adidas size read across to Decathlon. Letter sizes on the left, Letter on the right.
adidasadidas builds it forDecathlon, by chartSame labelDecathlon builds it forDecathlon also prints
2XSwaist 22 to 23.5 in, hip 31.5 to 33 in, inseam 30.5 in2XS2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 innot published
XSwaist 24 to 26 in, hip 33.5 to 35.5 in, inseam 31 in2XSXSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 innot published
Swaist 26.5 to 28.5 in, hip 36 to 38 in, inseam 31 inSSwaist 27.2 to 28.7 in, hip 35.4 to 37.8 innot published
Mwaist 29 to 31 in, hip 38.5 to 40.5 in, inseam 31.5 inMMwaist 29.1 to 31.1 in, hip 37.8 to 40.2 innot published
Lwaist 31.5 to 33.5 in, hip 41 to 43 in, inseam 31.5 inLLwaist 31.5 to 33.9 in, hip 40.2 to 42.5 innot published
XLwaist 34 to 37 in, hip 43.5 to 46 in, inseam 31.5 inXLXLwaist 34.3 to 36.6 in, hip 42.5 to 44.9 innot published
2XLwaist 37.5 to 41 in, hip 46.5 to 49 in, inseam 32 in2XL2XLwaist 37 to 39.4 in, hip 44.9 to 47.2 innot published
1Xwaist 35 to 38.5 in, hip 43.5 to 47 in, inseam 31 inXLnot publishedwaist 34.3 to 36.6 in, hip 42.5 to 44.9 innot published
2Xwaist 39 to 42.5 in, hip 47.5 to 51 in, inseam 31 in2XLnot publishedwaist 37 to 39.4 in, hip 44.9 to 47.2 innot published
3Xwaist 43 to 46.5 in, hip 51.5 to 55 in, inseam 30.5 innot madenot publishednot publishednot published
4Xwaist 47 to 50.5 in, hip 55.5 to 59 in, inseam 30 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Decathlon 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

Decathlon to adidas