Lucky Brand to Reformation jeans size

The short answer

Lucky Brand 0 is Reformation 25 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 Lucky Brand size read across to Reformation. US numeric sizes on the left, Waist size on the right.
Lucky Brand	Lucky Brand builds it for	Reformation, by chart	Same label	Reformation builds it for	Reformation also prints
0	waist 25.5 in, hip 36 in	25	not published	waist 25.5 in, hip 36 in	not published
2	waist 26.5 in, hip 37 in	26	26	waist 26.5 in, hip 37 in	not published
4	waist 27.5 in, hip 38 in	27	27	waist 27.5 in, hip 38 in	not published
6	waist 28.5 in, hip 39 in	28	28	waist 28.5 in, hip 39 in	not published
8	waist 29.5 in, hip 40 in	29	29	waist 30 in, hip 40.5 in	not published
10	waist 30.5 in, hip 41 in	29	30	waist 30 in, hip 40.5 in	not published

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

Lucky Brand size guide, read on 2026-09-18.
Reformation size guide, read on 2026-09-18. Reformation on TrueToSize

Reformation to Lucky Brand