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Marks & Spencer (Goodmove) to Sweaty Betty leggings size

The short answer

Marks & Spencer (Goodmove) 12 is Sweaty Betty 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.

Every Marks & Spencer (Goodmove) size read across to Sweaty Betty. UK sizes on the left, Letter on the right.
Marks & Spencer (Goodmove)Marks & Spencer (Goodmove) builds it forSweaty Betty, by chartSame labelSweaty Betty builds it forSweaty Betty also prints
6waist 24 in, hip 33.8 inXXS or XSnot publishedwaist 23 in, hip 34 inUS numeric 2
8waist 25.5 in, hip 35.5 inXSnot publishedwaist 25 in, hip 36 inUS numeric 4
10waist 27.5 in, hip 37.5 inSnot publishedwaist 27 in, hip 38 inUS numeric 6
12waist 29.5 in, hip 39.5 inMnot publishedwaist 29 in, hip 40 inUS numeric 8
14waist 31.8 in, hip 41.5 inL or XLnot publishedwaist 31 in, hip 42 inUS numeric 10
16waist 34 in, hip 43.3 inXLnot publishedwaist 33 in, hip 44 inUS numeric 12
18waist 36.3 in, hip 45.3 inXXLnot publishedwaist 36 in, hip 46.5 inUS numeric 14
20waist 38.5 in, hip 47.5 innot madenot publishednot publishednot published
22waist 41 in, hip 50 innot madenot publishednot publishednot published
24waist 43.3 in, hip 52.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Sweaty Betty chart. 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

Sweaty Betty to Marks & Spencer (Goodmove)