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Uniqlo to Spanx leggings size

The short answer

Uniqlo XXS is Spanx XS by the two brands' own charts. 6 of 7 Uniqlo sizes land on a different label at Spanx.

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 Spanx. Letter sizes on the left, Letter on the right.
UniqloUniqlo builds it forSpanx, by chartSame labelSpanx builds it forSpanx also prints
XXSwaist 22.5 to 24.8 in, hip 32.8 to 35 inXSnot publishedwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
XSwaist 24 to 26.5 in, hip 34.3 to 36.5 inXSXSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Swaist 25.5 to 28 in, hip 35.8 to 38.3 inXSSwaist 25 to 27 in, hip 34 to 36 inUS numeric 0-2
Mwaist 27.3 to 29.5 in, hip 37.5 to 39.8 inSMwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Lwaist 29.5 to 32 in, hip 39.8 to 42.3 inMLwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
XLwaist 32 to 34.3 in, hip 42.3 to 44.5 inLXLwaist 31 to 33.5 in, hip 40 to 42.5 inUS numeric 12-14
XXLwaist 34.3 to 36.5 in, hip 44.5 to 46.8 inXLnot publishedwaist 33.5 to 36 in, hip 42.5 to 45 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

Spanx to Uniqlo