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Alphalete to Nike leggings size

The short answer

Alphalete 2XS is Nike XXS by the two brands' own charts. 4 of 7 Alphalete 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.

Every Alphalete size read across to Nike. Letter sizes on the left, Letter on the right.
AlphaleteAlphalete builds it forNike, by chartSame labelNike builds it forNike also prints
2XSwaist 23 to 24 in, hip 33 to 34 inXXSXXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inUS numeric 0
XSwaist 25 to 26 in, hip 35 to 36 inXSXSwaist 23.5 to 26 in, hip 33 to 35.5 inUS numeric 0-2
Swaist 27 to 28 in, hip 37 to 38 inSSwaist 26 to 29 in, hip 35.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 30 in, hip 39 to 40 inMMwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
Lwaist 31 to 32 in, hip 41 to 42 inMLwaist 29 to 31.5 in, hip 38.5 to 41 inUS numeric 8-10
XLwaist 33 to 34 in, hip 43 to 44 inLXLwaist 31.5 to 34.5 in, hip 41 to 44 inUS numeric 12-14
2XLwaist 35 to 36 in, hip 45 to 46 inXLXXLwaist 34.5 to 38.5 in, hip 44 to 47 inUS numeric 16-18
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 Alphalete