Decathlon to Fabletics leggings size

The short answer

Decathlon 2XS is Fabletics XXS by the two brands' own charts. 2 of 7 Decathlon 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 Decathlon size read across to Fabletics. Letter sizes on the left, Letter on the right.
Decathlon	Decathlon builds it for	Fabletics, by chart	Same label	Fabletics builds it for	Fabletics also prints
2XS	waist 23.6 to 24.8 in, hip 31.1 to 33.5 in	XXS	XXS	waist 24 to 25 in, hip 33 to 35 in	US numeric 00
XS	waist 25.2 to 26.8 in, hip 33.5 to 35.4 in	XS	XS	waist 25.5 to 26.5 in, hip 36 to 37 in	US numeric 0-2
S	waist 27.2 to 28.7 in, hip 35.4 to 37.8 in	S	S	waist 27 to 28 in, hip 37.5 to 38.5 in	US numeric 4-6
M	waist 29.1 to 31.1 in, hip 37.8 to 40.2 in	M	M	waist 29 to 31 in, hip 39 to 41 in	US numeric 8-10
L	waist 31.5 to 33.9 in, hip 40.2 to 42.5 in	L	L	waist 32 to 34 in, hip 42 to 44 in	US numeric 12-14
XL	waist 34.3 to 36.6 in, hip 42.5 to 44.9 in	XL	XL	waist 35 to 37 in, hip 45 to 47 in	US numeric 16-18
2XL	waist 37 to 39.4 in, hip 44.9 to 47.2 in	XXL/1X	XXL/1X	waist 38 to 41 in, hip 48 to 51 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

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

Fabletics to Decathlon