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Decathlon to Sweaty Betty leggings size

The short answer

Decathlon 2XS is Sweaty Betty XS or XXS by the two brands' own charts. 5 of 7 Decathlon sizes land on a different label at Sweaty Betty.

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 Sweaty Betty. Letter sizes on the left, Letter on the right.
DecathlonDecathlon builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
2XSwaist 23.6 to 24.8 in, hip 31.1 to 33.5 inXS or XXSXXSwaist 25 in, hip 36 inUS numeric 4
XSwaist 25.2 to 26.8 in, hip 33.5 to 35.4 inXS or SXSwaist 25 in, hip 36 inUS numeric 4
Swaist 27.2 to 28.7 in, hip 35.4 to 37.8 inS or MSwaist 27 in, hip 38 inUS numeric 6
Mwaist 29.1 to 31.1 in, hip 37.8 to 40.2 inL or MMwaist 31 in, hip 42 inUS numeric 10
Lwaist 31.5 to 33.9 in, hip 40.2 to 42.5 inXLLwaist 33 in, hip 44 inUS numeric 12
XLwaist 34.3 to 36.6 in, hip 42.5 to 44.9 inXXLXLwaist 36 in, hip 46.5 inUS numeric 14
2XLwaist 37 to 39.4 in, hip 44.9 to 47.2 inXXLXXLwaist 36 in, hip 46.5 inUS numeric 14
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

Sweaty Betty to Decathlon