J.Crew to Reiss clothing size

The short answer

J.Crew 000 is Reiss 4 by the two brands' own charts.

Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.

Every J.Crew size read across to Reiss. US sizes on the left, UK on the right.
J.Crew	J.Crew builds it for	Reiss, by chart	Same label	Reiss builds it for	Reiss also prints
000	bust 31 in, waist 23 in	4	not published	bust 31 in, waist 24 in, hip 34 in	US 0 · Letter XS · FR 34 · IT 36 · AU 4 · EU (as printed) 32
000	bust 31 in, waist 23 in	4	not published	bust 31 in, waist 24 in, hip 34 in	US 0 · Letter XS · FR 34 · IT 36 · AU 4 · EU (as printed) 32
000	bust 31 in, waist 23 in	4	not published	bust 31 in, waist 24 in, hip 34 in	US 0 · Letter XS · FR 34 · IT 36 · AU 4 · EU (as printed) 32
2	bust 34 in, waist 26 in	8 or 10	6	bust 33 in, waist 26 in, hip 36 in	US 4 · Letter S · FR 38 · IT 40 · AU 8 · EU (as printed) 36
4	bust 35 in, waist 27 in	10	8	bust 35 in, waist 28 in, hip 38 in	US 6 · Letter S · FR 40 · IT 42 · AU 10 · EU (as printed) 38
6	bust 36 in, waist 28 in	10 or 12	10	bust 35 in, waist 28 in, hip 38 in	US 6 · Letter S · FR 40 · IT 42 · AU 10 · EU (as printed) 38
8	bust 37 in, waist 29 in	12	12	bust 37 in, waist 30 in, hip 40 in	US 8 · Letter M · FR 42 · IT 44 · AU 12 · EU (as printed) 40
10	bust 38 in, waist 30 in	12 or 14	14	bust 37 in, waist 30 in, hip 40 in	US 8 · Letter M · FR 42 · IT 44 · AU 12 · EU (as printed) 40
12	bust 39.5 in, waist 31.5 in	14	16	bust 39 in, waist 31.5 in, hip 42 in	US 10 · Letter M · FR 44 · IT 46 · AU 14 · EU (as printed) 42
14	bust 41 in, waist 33 in	16	18	bust 41 in, waist 33.5 in, hip 44 in	US 12 · Letter L · FR 46 · IT 48 · AU 16 · EU (as printed) 44
16	bust 43.5 in, waist 35.5 in	18	not published	bust 43 in, waist 36 in, hip 46.5 in	US 14 · Letter L · FR 48 · IT 50 · AU 18 · EU (as printed) 46
18	bust 46 in, waist 38 in	not made	not published	not published	not published
20	bust 48.5 in, waist 40.5 in	not made	not published	not published	not published
22	bust 51 in, waist 43 in	not made	not published	not published	not published
24	bust 53.5 in, waist 45.5 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Reiss chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

J.Crew size guide, read on 2026-09-18.
Reiss size guide, read on 2026-09-18.

Reiss to J.Crew