Marks & Spencer (Goodmove) to Gymshark leggings size
The short answer
Marks & Spencer (Goodmove) 12 is Gymshark M by the two brands' own charts.
Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.
| Marks & Spencer (Goodmove) | Marks & Spencer (Goodmove) builds it for | Gymshark, by chart | Same label | Gymshark builds it for | Gymshark also prints |
|---|---|---|---|---|---|
| 6 | waist 24 in, hip 33.8 in | XXS | not published | waist 24 in, hip 35.5 in | US numeric 2-4 |
| 8 | waist 25.5 in, hip 35.5 in | XS | not published | waist 26 in, hip 37.5 in | US numeric 4-6 |
| 10 | waist 27.5 in, hip 37.5 in | S | not published | waist 28 in, hip 39.5 in | US numeric 6-8 |
| 12 | waist 29.5 in, hip 39.5 in | M | not published | waist 30 in, hip 41.5 in | US numeric 8-10 |
| 14 | waist 31.8 in, hip 41.5 in | L | not published | waist 32 in, hip 43.5 in | US numeric 10-12 |
| 16 | waist 34 in, hip 43.3 in | XL | not published | waist 34 in, hip 45.5 in | US numeric 12-14 |
| 18 | waist 36.3 in, hip 45.3 in | XXL | not published | waist 36 in, hip 47.7 in | US numeric 14-16 |
| 20 | waist 38.5 in, hip 47.5 in | not made | not published | not published | not published |
| 22 | waist 41 in, hip 50 in | not made | not published | not published | not published |
| 24 | waist 43.3 in, hip 52.5 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
- Marks & Spencer (Goodmove) size guide, read on 2026-09-18.
- Gymshark size guide, read on 2026-09-17. Gymshark on TrueToSize