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Nike to lululemon leggings size

The short answer

Nike XXS is lululemon 2 by the two brands' own charts.

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 lululemon. Letter sizes on the left, US numeric on the right.
NikeNike builds it forlululemon, by chartSame labellululemon builds it forlululemon also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 in20waist 23 in, hip 33 inLetter XXS
XSwaist 23.5 to 26 in, hip 33 to 35.5 in4not publishedwaist 25 in, hip 35 inLetter XS
Swaist 26 to 29 in, hip 35.5 to 38.5 in6not publishedwaist 27 in, hip 37 inLetter S
Mwaist 29 to 31.5 in, hip 38.5 to 41 in10 or 8not publishedwaist 31 in, hip 41 inLetter L
Lwaist 31.5 to 34.5 in, hip 41 to 44 in12not publishedwaist 33 in, hip 43 inLetter XL
XLwaist 34.5 to 38.5 in, hip 44 to 47 in14 or 16not publishedwaist 35 in, hip 45 inLetter XXL
XXLwaist 38.5 to 42.5 in, hip 47 to 50 in18not publishedwaist 41 in, hip 49 innot published
0Xwaist 40 to 43 in, hip 48 to 51 in18not publishedwaist 41 in, hip 49 innot published
1Xwaist 43 to 45.5 in, hip 51 to 54 in20not publishedwaist 43 in, hip 51 innot 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. 3 sizes have no counterpart on the lululemon 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

lululemon to Nike