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Uniqlo to Nike leggings size

The short answer

Uniqlo XXS is Nike XS by the two brands' own charts. 5 of 7 Uniqlo sizes land on a different label at Nike.

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 Nike. Letter sizes on the left, Letter on the right.
UniqloUniqlo builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 22.5 to 24.8 in, hip 32.8 to 35 inXSXXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
XSwaist 24 to 26.5 in, hip 34.3 to 36.5 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 25.5 to 28 in, hip 35.8 to 38.3 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 27.3 to 29.5 in, hip 37.5 to 39.8 inSMwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Lwaist 29.5 to 32 in, hip 39.8 to 42.3 inMLwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
XLwaist 32 to 34.3 in, hip 42.3 to 44.5 inLXLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XXLwaist 34.3 to 36.5 in, hip 44.5 to 46.8 inXLXXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
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

Nike to Uniqlo