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Nike to Decathlon leggings size

The short answer

Nike XXS is Decathlon 2XS by the two brands' own charts. 4 of 8 Nike 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 Nike size read across to Decathlon. Letter sizes on the left, Letter on the right.
NikeNike builds it forDecathlon, by chartSame labelDecathlon builds it forDecathlon also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 in2XS2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 innot published
XSwaist 23.5 to 26 in, hip 33 to 35.5 in2XSXSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 innot published
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 27.2 to 28.7 in, hip 35.4 to 37.8 innot published
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMMwaist 29.1 to 31.1 in, hip 37.8 to 40.2 innot published
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLLwaist 31.5 to 33.9 in, hip 40.2 to 42.5 innot published
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXLXLwaist 34.3 to 36.6 in, hip 42.5 to 44.9 innot published
XXLwaist 38.5 to 42.5 in, hip 47 to 50 in2XL2XLwaist 37 to 39.4 in, hip 44.9 to 47.2 innot published
0Xwaist 40 to 43 in, hip 48 to 51 in2XLnot publishedwaist 37 to 39.4 in, hip 44.9 to 47.2 innot published
1Xwaist 43 to 45.5 in, hip 51 to 54 innot madenot publishednot publishednot published
2Xwaist 45.5 to 49 in, hip 54 to 57 innot madenot publishednot publishednot published
3Xwaist 49 to 53 in, hip 57 to 61 innot madenot publishednot publishednot published
4Xwaist 53 to 57 in, hip 61 to 65 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 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 Nike