Uniqlo to Alphalete leggings size

The short answer

Uniqlo XXS is Alphalete 2XS by the two brands' own charts. 3 of 7 Uniqlo sizes land on a different label at Alphalete.

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

Every Uniqlo size read across to Alphalete. Letter sizes on the left, Letter on the right.
Uniqlo	Uniqlo builds it for	Alphalete, by chart	Same label	Alphalete builds it for	Alphalete also prints
XXS	waist 22.5 to 24.8 in, hip 32.8 to 35 in	2XS	2XS	waist 23 to 24 in, hip 33 to 34 in	not published
XS	waist 24 to 26.5 in, hip 34.3 to 36.5 in	XS	XS	waist 25 to 26 in, hip 35 to 36 in	not published
S	waist 25.5 to 28 in, hip 35.8 to 38.3 in	S	S	waist 27 to 28 in, hip 37 to 38 in	not published
M	waist 27.3 to 29.5 in, hip 37.5 to 39.8 in	S or M	M	waist 27 to 28 in, hip 37 to 38 in	not published
L	waist 29.5 to 32 in, hip 39.8 to 42.3 in	L	L	waist 31 to 32 in, hip 41 to 42 in	not published
XL	waist 32 to 34.3 in, hip 42.3 to 44.5 in	XL	XL	waist 33 to 34 in, hip 43 to 44 in	not published
XXL	waist 34.3 to 36.5 in, hip 44.5 to 46.8 in	2XL	2XL	waist 35 to 36 in, hip 45 to 46 in	not published

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

Uniqlo size guide, read on 2026-09-18. Uniqlo on TrueToSize
Alphalete size guide, read on 2026-09-18. Alphalete on TrueToSize

Alphalete to Uniqlo