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Nike to Year of Ours leggings size

The short answer

Nike XS is Year of Ours Extra Small by the two brands' own charts. 7 of 7 Nike sizes land on a different label at Year of Ours.

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 Year of Ours. Letter sizes on the left, Letter on the right.
NikeNike builds it forYear of Ours, by chartSame labelYear of Ours builds it forYear of Ours also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 innot madenot publishednot publishednot published
XSwaist 23.5 to 26 in, hip 33 to 35.5 inExtra Smallnot publishedwaist 25 to 26.5 in, hip 35 to 37 inUS numeric 2-4
Swaist 26 to 29 in, hip 35.5 to 38.5 inSmallSmallwaist 27 to 28 in, hip 38 to 40 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMediumMediumwaist 29 to 32 in, hip 41 to 43 inUS numeric 6-8
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLargeLargewaist 33 to 35 in, hip 44 to 46 inUS numeric 10-12
XLwaist 34.5 to 38.5 in, hip 44 to 47 inExtra Largenot publishedwaist 36 to 38 in, hip 47 to 49 inUS numeric 14-16
XXLwaist 38.5 to 42.5 in, hip 47 to 50 in2Xnot publishedwaist 39 to 41 in, hip 50 to 52 inUS numeric 18-20
0Xwaist 40 to 43 in, hip 48 to 51 in2Xnot publishedwaist 39 to 41 in, hip 50 to 52 inUS numeric 18-20
1Xwaist 43 to 45.5 in, hip 51 to 54 innot madenot publishednot publishednot published
2Xwaist 45.5 to 49 in, hip 54 to 57 innot made2Xnot 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. 5 sizes have no counterpart on the Year of Ours 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

Year of Ours to Nike