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Marks & Spencer (Goodmove) to Old Navy leggings size

The short answer

Marks & Spencer (Goodmove) 16 is Old Navy L 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 Old Navy. UK sizes on the left, Letter on the right.
Marks & Spencer (Goodmove)Marks & Spencer (Goodmove) builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
6waist 24 in, hip 33.8 inXXSnot publishedwaist 24 in, hip 34.5 inUS numeric 00
8waist 25.5 in, hip 35.5 inXSnot publishedwaist 25 to 26 in, hip 35.5 to 36.5 inUS numeric 0-2
10waist 27.5 in, hip 37.5 inSnot publishedwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
12waist 29.5 in, hip 39.5 inMnot publishedwaist 29 to 30 in, hip 39.5 to 40.5 inUS numeric 8-10
14waist 31.8 in, hip 41.5 inLnot publishedwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
16waist 34 in, hip 43.3 inLnot publishedwaist 31.5 to 33.5 in, hip 42 to 44 inUS numeric 12-14
18waist 36.3 in, hip 45.3 inXLnot publishedwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
20waist 38.5 in, hip 47.5 inXLnot publishedwaist 36.3 to 39 in, hip 46.5 to 49 inUS numeric 16-18
22waist 41 in, hip 50 inXXLnot publishedwaist 42 in, hip 51.5 inUS numeric 20
24waist 43.3 in, hip 52.5 in2Xnot publishedwaist 42 to 44.3 in, hip 51.5 to 53.8 inUS 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

Old Navy to Marks & Spencer (Goodmove)