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Fabletics to Nike leggings size

The short answer

Fabletics XXS is Nike XS by the two brands' own charts. 7 of 12 Fabletics 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.

On 3 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Fabletics size read across to Nike. Letter sizes on the left, Letter on the right.
FableticsFabletics builds it forNike, by chartSame labelNike builds it forNike also prints
XXSwaist 24 to 25 in, hip 33 to 35 inXSXXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
XSwaist 25.5 to 26.5 in, hip 36 to 37 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 27 to 28 in, hip 37.5 to 38.5 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31 in, hip 39 to 41 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 32 to 34 in, hip 42 to 44 inLLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
XLwaist 35 to 37 in, hip 45 to 47 inXLXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
XXL/1Xwaist 38 to 41 in, hip 48 to 51 inXXLnot publishedwaist 38.5 to 42.5 in, hip 47 to 50 inUS numeric 20-22
2Xwaist 41 to 43 in, hip 51 to 53 in0X2Xwaist 40 to 43 in, hip 48 to 51 inUS numeric 16W
3Xwaist 43 to 45 in, hip 53 to 55 in1X3Xwaist 43 to 45.5 in, hip 51 to 54 inUS numeric 18W-20W
4Xwaist 45 to 47 in, hip 55 to 57 in2X4Xwaist 45.5 to 49 in, hip 54 to 57 inUS numeric 22W-24W
5Xwaist 47 to 49 in, hip 57 to 59 in2Xnot publishedwaist 45.5 to 49 in, hip 54 to 57 inUS numeric 22W-24W
6Xwaist 49 to 51 in, hip 59 to 61 in3Xnot publishedwaist 49 to 53 in, hip 57 to 61 inUS numeric 26W-28W
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 Fabletics