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Reformation to Ksubi jeans size

The short answer

Reformation 27 is Ksubi 5 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 Ksubi. Waist size sizes on the left, US numeric on the right.
ReformationReformation builds it forKsubi, by chartSame labelKsubi builds it forKsubi also prints
23waist 23.5 in, hip 34 in1not publishedwaist 23.5 in, hip 34 inWaist size 23 · Letter XXS
24waist 24.5 in, hip 35 in2not publishedwaist 24.5 in, hip 35 inWaist size 24 · Letter XS
25waist 25.5 in, hip 36 in3not publishedwaist 25.5 in, hip 36 inWaist size 25 · Letter XS
26waist 26.5 in, hip 37 in4not publishedwaist 26.5 in, hip 37 inWaist size 26 · Letter S
27waist 27.5 in, hip 38 in5not publishedwaist 27.5 in, hip 38 inWaist size 27 · Letter S
28waist 28.5 in, hip 39 in6not publishedwaist 28.5 in, hip 39 inWaist size 28 · Letter M
29waist 30 in, hip 40.5 in7 or 8not publishedwaist 29.5 in, hip 40 inWaist size 29 · Letter M
30waist 31.5 in, hip 42 in9not publishedwaist 31.5 in, hip 42 inWaist size 31 · Letter L
31waist 33.3 in, hip 43.8 in11not publishedwaist 33.5 in, hip 44 inWaist size 33 · Letter XL
32waist 38.5 in, hip 49 innot madenot publishednot publishednot published
33waist 39 in, hip 50 innot madenot publishednot publishednot published
34waist 40 in, hip 51 innot madenot publishednot publishednot published
35waist 41 in, hip 52 innot madenot publishednot publishednot published
36waist 42 in, hip 53 innot madenot publishednot publishednot published
38waist 44 in, hip 55 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 6 sizes have no counterpart on the Ksubi 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

Ksubi to Reformation