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Convert / Women's clothing

Gap to Reiss clothing size

The short answer

Gap 10 is Reiss 12 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 Gap size read across to Reiss. US sizes on the left, UK on the right.
GapGap builds it forReiss, by chartSame labelReiss builds it forReiss also prints
000bust 30.3 in, waist 24 in, hip 33.3 innot madenot publishednot publishednot published
000bust 30.3 in, waist 24 in, hip 33.3 innot madenot publishednot publishednot published
000bust 30.3 in, waist 24 in, hip 33.3 innot madenot publishednot publishednot published
2bust 33.3 in, waist 26.5 in, hip 36.3 in8not publishedbust 33 in, waist 26 in, hip 36 inUS 4 · Letter S · FR 38 · IT 40 · AU 8 · EU (as printed) 36
4bust 34.3 in, waist 27.5 in, hip 37.3 in10 or 8not publishedbust 35 in, waist 28 in, hip 38 inUS 6 · Letter S · FR 40 · IT 42 · AU 10 · EU (as printed) 38
6bust 35.3 in, waist 28.5 in, hip 38.3 in10not publishedbust 35 in, waist 28 in, hip 38 inUS 6 · Letter S · FR 40 · IT 42 · AU 10 · EU (as printed) 38
8bust 36.3 in, waist 29.5 in, hip 39.3 in12 or 10not publishedbust 37 in, waist 30 in, hip 40 inUS 8 · Letter M · FR 42 · IT 44 · AU 12 · EU (as printed) 40
10bust 37.3 in, waist 30.5 in, hip 40.3 in12not publishedbust 37 in, waist 30 in, hip 40 inUS 8 · Letter M · FR 42 · IT 44 · AU 12 · EU (as printed) 40
12bust 38.8 in, waist 32 in, hip 41.8 in14not publishedbust 39 in, waist 31.5 in, hip 42 inUS 10 · Letter M · FR 44 · IT 46 · AU 14 · EU (as printed) 42
14bust 40.3 in, waist 33.5 in, hip 43.3 in16 or 14not publishedbust 41 in, waist 33.5 in, hip 44 inUS 12 · Letter L · FR 46 · IT 48 · AU 16 · EU (as printed) 44
16bust 42 in, waist 35.5 in, hip 45.3 in16 or 18not publishedbust 41 in, waist 33.5 in, hip 44 inUS 12 · Letter L · FR 46 · IT 48 · AU 16 · EU (as printed) 44
18bust 43.8 in, waist 37.5 in, hip 47.3 in18not publishedbust 43 in, waist 36 in, hip 46.5 inUS 14 · Letter L · FR 48 · IT 50 · AU 18 · EU (as printed) 46
20bust 45.8 in, waist 39.5 in, hip 49.3 innot madenot publishednot publishednot published
22bust 47.8 in, waist 41.5 in, hip 51.3 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 5 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

Reiss to Gap