Alphalete to Fabletics leggings size

The short answer

Alphalete 2XS is Fabletics XXS by the two brands' own charts. 4 of 7 Alphalete sizes land on a different label at Fabletics.

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 Fabletics. Letter sizes on the left, Letter on the right.
Alphalete	Alphalete builds it for	Fabletics, by chart	Same label	Fabletics builds it for	Fabletics also prints
2XS	waist 23 to 24 in, hip 33 to 34 in	XXS	XXS	waist 24 to 25 in, hip 33 to 35 in	US numeric 00
XS	waist 25 to 26 in, hip 35 to 36 in	XS	XS	waist 25.5 to 26.5 in, hip 36 to 37 in	US numeric 0-2
S	waist 27 to 28 in, hip 37 to 38 in	S	S	waist 27 to 28 in, hip 37.5 to 38.5 in	US numeric 4-6
M	waist 29 to 30 in, hip 39 to 40 in	M	M	waist 29 to 31 in, hip 39 to 41 in	US numeric 8-10
L	waist 31 to 32 in, hip 41 to 42 in	M or L	L	waist 29 to 31 in, hip 39 to 41 in	US numeric 8-10
XL	waist 33 to 34 in, hip 43 to 44 in	L	XL	waist 32 to 34 in, hip 42 to 44 in	US numeric 12-14
2XL	waist 35 to 36 in, hip 45 to 46 in	XL	XXL/1X	waist 35 to 37 in, hip 45 to 47 in	US 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

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

Fabletics to Alphalete