Reformation to Acne Studios jeans size

The short answer

Reformation 27 is Acne Studios 38 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 Reformation size read across to Acne Studios. Waist size sizes on the left, US numeric on the right.
Reformation	Reformation builds it for	Acne Studios, by chart	Same label	Acne Studios builds it for	Acne Studios also prints
23	waist 23.5 in, hip 34 in	32	not published	waist 23.5 in, hip 33 in	Letter XXS · UK 4 · FR 34 · IT 38 · JP 3
24	waist 24.5 in, hip 35 in	34	not published	waist 25 in, hip 34.5 in	Letter XS · UK 6 · FR 36 · IT 40 · JP 5
25	waist 25.5 in, hip 36 in	34	not published	waist 25 in, hip 34.5 in	Letter XS · UK 6 · FR 36 · IT 40 · JP 5
26	waist 26.5 in, hip 37 in	36	not published	waist 26.5 in, hip 36 in	Letter S · UK 8 · FR 38 · IT 42 · JP 7
27	waist 27.5 in, hip 38 in	38	not published	waist 28 in, hip 37.5 in	Letter M · UK 10 · FR 40 · IT 44 · JP 9
28	waist 28.5 in, hip 39 in	38	not published	waist 28 in, hip 37.5 in	Letter M · UK 10 · FR 40 · IT 44 · JP 9
29	waist 30 in, hip 40.5 in	40	not published	waist 30 in, hip 39.5 in	Letter L · UK 12 · FR 42 · IT 46 · JP 11
30	waist 31.5 in, hip 42 in	42	not published	waist 31.5 in, hip 42.5 in	Letter XL · UK 14 · FR 44 · IT 48 · JP 13
31	waist 33.3 in, hip 43.8 in	44	not published	waist 33 in, hip 44.5 in	Letter XXL · UK 16 · FR 46 · IT 50 · JP 15
32	waist 38.5 in, hip 49 in	not made	not published	not published	not published
33	waist 39 in, hip 50 in	not made	not published	not published	not published
34	waist 40 in, hip 51 in	not made	not published	not published	not published
35	waist 41 in, hip 52 in	not made	not published	not published	not published
36	waist 42 in, hip 53 in	not made	not published	not published	not published
38	waist 44 in, hip 55 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 6 sizes have no counterpart on the Acne Studios 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

Reformation size guide, read on 2026-09-18. Reformation on TrueToSize
Acne Studios size guide, read on 2026-09-18.

Acne Studios to Reformation