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Decathlon to SKIMS leggings size

The short answer

Decathlon 2XS is SKIMS XS by the two brands' own charts. 2 of 7 Decathlon sizes land on a different label at SKIMS.

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 SKIMS. Letter sizes on the left, Letter on the right.
DecathlonDecathlon builds it forSKIMS, by chartSame labelSKIMS builds it forSKIMS also prints
2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 inXSXXSwaist 24 to 26 in, hip 34 to 36.5 inUS numeric 0-2
XSwaist 25.2 to 26.8 in, hip 33.5 to 35.4 inXSXSwaist 24 to 26 in, hip 34 to 36.5 inUS numeric 0-2
Swaist 27.2 to 28.7 in, hip 35.4 to 37.8 inSSwaist 26.5 to 28.5 in, hip 37 to 39 inUS numeric 4-6
Mwaist 29.1 to 31.1 in, hip 37.8 to 40.2 inMMwaist 29 to 31 in, hip 39.5 to 41.5 inUS numeric 8-10
Lwaist 31.5 to 33.9 in, hip 40.2 to 42.5 inLLwaist 31.5 to 34.5 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34.3 to 36.6 in, hip 42.5 to 44.9 inXLXLwaist 35 to 38 in, hip 44.5 to 47.5 inUS numeric 16
2XLwaist 37 to 39.4 in, hip 44.9 to 47.2 inXLnot publishedwaist 35 to 38 in, hip 44.5 to 47.5 inUS numeric 16
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

SKIMS to Decathlon