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Nike to Onzie leggings size

The short answer

Nike XXS is Onzie X/S by the two brands' own charts. 7 of 8 Nike sizes land on a different label at Onzie.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Nike size read across to Onzie. Letter sizes on the left, Letter on the right.
NikeNike builds it forOnzie, by chartSame labelOnzie builds it forOnzie also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inX/Snot publishedwaist 24 to 26 in, hip 33 to 35 inUS numeric 0-2
XSwaist 23.5 to 26 in, hip 33 to 35.5 inX/Snot publishedwaist 24 to 26 in, hip 33 to 35 inUS numeric 0-2
Swaist 26 to 29 in, hip 35.5 to 38.5 inS/MX/Swaist 26 to 28 in, hip 36 to 38 inUS numeric 2-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inM/LS/Mwaist 28 to 31 in, hip 38 to 40 inUS numeric 6-8
Lwaist 31.5 to 34.5 in, hip 41 to 44 inL/LM/Lwaist 31 to 33 in, hip 40 to 42 inUS numeric 10-12
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXLXLwaist 34 to 37 in, hip 43 to 45 inUS numeric 14-16
XXLwaist 38.5 to 42.5 in, hip 47 to 50 in1Xnot publishedwaist 38 to 40 in, hip 46 to 48 inUS numeric 16-18
0Xwaist 40 to 43 in, hip 48 to 51 in1Xnot publishedwaist 38 to 40 in, hip 46 to 48 inUS numeric 16-18
1Xwaist 43 to 45.5 in, hip 51 to 54 innot made1Xnot publishednot published
2Xwaist 45.5 to 49 in, hip 54 to 57 innot madenot publishednot publishednot published
3Xwaist 49 to 53 in, hip 57 to 61 innot madenot publishednot publishednot published
4Xwaist 53 to 57 in, hip 61 to 65 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Onzie chart. 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

Onzie to Nike