Spanx to Decathlon leggings size
The short answer
Spanx 1X is Decathlon 2XL by the two brands' own charts. 2 of 7 Spanx sizes land on a different label at Decathlon.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
| Spanx | Spanx builds it for | Decathlon, by chart | Same label | Decathlon builds it for | Decathlon also prints |
|---|---|---|---|---|---|
| XS | waist 25 to 27 in, hip 34 to 36 in | XS | XS | waist 25.2 to 26.8 in, hip 33.5 to 35.4 in | not published |
| S | waist 27 to 29 in, hip 36 to 38 in | S | S | waist 27.2 to 28.7 in, hip 35.4 to 37.8 in | not published |
| M | waist 29 to 31 in, hip 38 to 40 in | M | M | waist 29.1 to 31.1 in, hip 37.8 to 40.2 in | not published |
| L | waist 31 to 33.5 in, hip 40 to 42.5 in | L | L | waist 31.5 to 33.9 in, hip 40.2 to 42.5 in | not published |
| XL | waist 33.5 to 36 in, hip 42.5 to 45 in | XL | XL | waist 34.3 to 36.6 in, hip 42.5 to 44.9 in | not published |
| 1X | waist 36 to 39 in, hip 45 to 48 in | 2XL | not published | waist 37 to 39.4 in, hip 44.9 to 47.2 in | not published |
| 2X | waist 39 to 42 in, hip 48 to 51 in | 2XL | not published | waist 37 to 39.4 in, hip 44.9 to 47.2 in | not published |
| 3X | waist 42 to 45 in, hip 51 to 54 in | not made | not published | not published | not published |
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.
Sources
- Spanx size guide, read on 2026-09-18. Spanx on TrueToSize
- Decathlon size guide, read on 2026-09-18.