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Reformation to G-Star RAW jeans size

The short answer

Reformation 25 is G-Star RAW 24 by the two brands' own charts. 11 of 13 Reformation sizes land on a different label at G-Star RAW.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

On 6 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Reformation size read across to G-Star RAW. Waist size sizes on the left, Waist size on the right.
ReformationReformation builds it forG-Star RAW, by chartSame labelG-Star RAW builds it forG-Star RAW also prints
23waist 23.5 in, hip 34 innot madenot publishednot publishednot published
24waist 24.5 in, hip 35 innot made24not publishednot published
25waist 25.5 in, hip 36 in2425waist 25.2 in, hip 30.7 innot published
26waist 26.5 in, hip 37 in2526waist 26.2 in, hip 31.7 innot published
27waist 27.5 in, hip 38 in2627waist 27.2 in, hip 32.7 innot published
28waist 28.5 in, hip 39 in27 or 2828waist 28.2 in, hip 33.7 innot published
29waist 30 in, hip 40.5 in2929waist 30.1 in, hip 35.6 innot published
30waist 31.5 in, hip 42 in30 or 3130waist 31.1 in, hip 36.6 innot published
31waist 33.3 in, hip 43.8 in3231waist 33.1 in, hip 38.6 innot published
32waist 38.5 in, hip 49 in3832waist 39.2 in, hip 44.5 innot published
33waist 39 in, hip 50 in3833waist 39.2 in, hip 44.5 innot published
34waist 40 in, hip 51 in38 or 4034waist 39.2 in, hip 44.5 innot published
35waist 41 in, hip 52 in4035waist 41.3 in, hip 46.5 innot published
36waist 42 in, hip 53 in4036waist 41.3 in, hip 46.5 innot published
38waist 44 in, hip 55 in4238waist 43.5 in, hip 48.4 innot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the G-Star RAW 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

G-Star RAW to Reformation