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Ksubi to Reformation jeans size

The short answer

Ksubi 8 is Reformation 29 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.

On 2 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 Ksubi size read across to Reformation. US numeric sizes on the left, Waist size on the right.
KsubiKsubi builds it forReformation, by chartSame labelReformation builds it forReformation also prints
0waist 22.5 in, hip 33 innot madenot publishednot publishednot published
1waist 23.5 in, hip 34 in2323waist 23.5 in, hip 34 innot published
2waist 24.5 in, hip 35 in2424waist 24.5 in, hip 35 innot published
3waist 25.5 in, hip 36 in2525waist 25.5 in, hip 36 innot published
4waist 26.5 in, hip 37 in2626waist 26.5 in, hip 37 innot published
5waist 27.5 in, hip 38 in2727waist 27.5 in, hip 38 innot published
6waist 28.5 in, hip 39 in2828waist 28.5 in, hip 39 innot published
7waist 29.5 in, hip 40 in2929waist 30 in, hip 40.5 innot published
8waist 30.5 in, hip 41 in2930waist 30 in, hip 40.5 innot published
9waist 31.5 in, hip 42 in3031waist 31.5 in, hip 42 innot published
10waist 32.5 in, hip 43 in31 or 3032waist 33.3 in, hip 43.8 innot published
11waist 33.5 in, hip 44 in3133waist 33.3 in, hip 43.8 innot published
12waist 34.5 in, hip 45 in3134waist 33.3 in, hip 43.8 innot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Reformation 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 to Ksubi