Banana Republic to Reiss clothing size

The short answer

Banana Republic 6 is Reiss 10 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 Banana Republic size read across to Reiss. US sizes on the left, UK on the right.
Banana Republic	Banana Republic builds it for	Reiss, by chart	Same label	Reiss builds it for	Reiss also prints
000	bust 30.5 in, waist 24 in, hip 33.5 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 30.5 in, waist 24 in, hip 33.5 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 30.5 in, waist 24 in, hip 33.5 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 33.5 in, waist 27 in, hip 36.5 in	8	not published	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 34.5 in, waist 28 in, hip 37.5 in	10	not published	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 35.5 in, waist 29 in, hip 38.5 in	10	not published	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 36.5 in, waist 30 in, hip 39.5 in	12	not published	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 37.5 in, waist 31 in, hip 40.5 in	12	not published	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 in, waist 32.5 in, hip 42 in	14	not published	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 40.5 in, waist 34 in, hip 43.5 in	16	not published	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 42.5 in, waist 36 in, hip 45.5 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 44.5 in, waist 38 in, hip 47.5 in	not made	not published	not published	not published
20	bust 47.5 in, waist 41 in, hip 50.5 in	not made	not published	not published	not published

Tinted rows change label or sit between two sizes. 2 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

Banana Republic size guide, read on 2026-09-18.
Reiss size guide, read on 2026-09-18.

Reiss to Banana Republic