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Uniqlo to Sweaty Betty leggings size

The short answer

Uniqlo M is Sweaty Betty M by the two brands' own charts. 0 of 7 Uniqlo 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 Uniqlo size read across to Sweaty Betty. Letter sizes on the left, Letter on the right.
UniqloUniqlo builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
XXSwaist 22.5 to 24.8 in, hip 32.8 to 35 inXXSXXSwaist 23 in, hip 34 inUS numeric 2
XSwaist 24 to 26.5 in, hip 34.3 to 36.5 inXSXSwaist 25 in, hip 36 inUS numeric 4
Swaist 25.5 to 28 in, hip 35.8 to 38.3 inSSwaist 27 in, hip 38 inUS numeric 6
Mwaist 27.3 to 29.5 in, hip 37.5 to 39.8 inMMwaist 29 in, hip 40 inUS numeric 8
Lwaist 29.5 to 32 in, hip 39.8 to 42.3 inLLwaist 31 in, hip 42 inUS numeric 10
XLwaist 32 to 34.3 in, hip 42.3 to 44.5 inXLXLwaist 33 in, hip 44 inUS numeric 12
XXLwaist 34.3 to 36.5 in, hip 44.5 to 46.8 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 Uniqlo