Smartwool to Fabletics leggings size

The short answer

Smartwool S is Fabletics M by the two brands' own charts. 5 of 5 Smartwool 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 Smartwool size read across to Fabletics. Letter sizes on the left, Letter on the right.
Smartwool	Smartwool builds it for	Fabletics, by chart	Same label	Fabletics builds it for	Fabletics also prints
S	waist 29 to 31 in, hip 36 to 38 in	M	S	waist 29 to 31 in, hip 39 to 41 in	US numeric 8-10
M	waist 32 to 34 in, hip 39 to 41 in	L	M	waist 32 to 34 in, hip 42 to 44 in	US numeric 12-14
L	waist 35 to 37 in, hip 42 to 44 in	XL	L	waist 35 to 37 in, hip 45 to 47 in	US numeric 16-18
XL	waist 38 to 40 in, hip 45 to 48 in	XXL/1X	XL	waist 38 to 41 in, hip 48 to 51 in	US numeric 16-18
XXL	waist 41 to 44 in, hip 49 to 51 in	2X	XXL/1X	waist 41 to 43 in, hip 51 to 53 in	US numeric 20-22

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

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

Fabletics to Smartwool