SW Fitting Room

Size Guide

Sizing of bras

All of our bras are available in a selection of sizes:

32 A B C D DD
34 A B C D DD
36 A B C D DD
38 A B C D  

Do you need custom sizing?

All briefs and bodywear products are available in sizes 8 – 16

Equivalent UK 8 10 12 14 16
Bust 79cm / 31″ 84cm / 33″ 89cm / 35″ 94cm / 37″ 99cm / 39″
Waist 61cm / 24″ 66cm / 26″ 71cm / 28″ 76cm / 30″ 80cm / 32″
Upper hip (10cm from waist) 79cm / 31″ 84cm / 33″ 89cm / 35″ 94cm / 37″ 99cm / 39″
Lower hip (20cm from waist) 89cm / 35″ 94cm / 37″ 99cm / 39″ 104cm / 41″ 109cm / 43″
UK Cup size (approx) 32A 34B/32C 36B/34C/32D 38B/36C/34D 38C/36D/34DD

International size conventions

UK US EU FR NZ/AU Japan Italy
32A 32A 70A 85A 10A 60A 1A
32B 32B 70B 85B 10B 60B 1B
32C 32C 70C 85C 10C 60C 1C
32D 32D 70D 85D 10D 60D 1D
32DD 32DD 70E 85E 10DD 60DD 1DD
34A 34A 75A 90A 12A 70A 2A
34B 34B 75B 90B 12B 70B 2B
34C 34C 75C 90C 12C 70C 2C
34D 34D 75D 90D 12D 70D 2D
34DD 34DD 75E 90E 12DD 70DD 2DD
36B 36A 80A 95A 14A 80A 3A
36B 36B 80B 95B 14B 80B 3B
36C 36C 80C 95C 14C 80C 3C
36D 36D 80D 95D 14D 80D 3D
36DD 36DD 80E 95E 14DD 80DD 3DD
38A 38A 85A 100A 16A 90A 4A
38B 38B 85B 100B 16B 90B 4B
38C 38C 85C 100C 16C 90C 4C
38D 38D 85D 100D 16D 90D 4D
UK US EU FR NZ/AU Japan Italy
6 2 32 34 6 7 38
8 4 34 36 8 9 40
10 6 36 38 10 11 42
12 8 38 40 12 13 44
14 10 40 42 14 15 46
16 12 42 44 16 17 48

Calculating your bra size

Measuring your underband

Start by holding the tip of a tape measure just under your right breast. Slowly wrap the tape measure around your chest. Make sure you hold it tight to your rib cage. If your under-bust measurement is an even number, add 4 inches. If it’s an odd number add 5 inches. This will give you your band measurement (32, 34, 36, etc).

Measuring your overbust

Start measuring from your nipple. This is usually the fullest part of your bust. When you measure around, make sure you stay close to the fullest part of your back as well. This will be your overbust measurement. The difference between the overbust measurement and your calculated overband measurement will indicate your cup size.

1″ smaller = AA cup
No difference = A cup
1″ larger = B cup
2″ larger = C cup
3″ larger = D cup

For example, if your under-bust measurement equals 27″, add 5″ due to it being an odd number. Your underband size would be a 32.

If your overbust measurement equals 34″, the difference is therefore 2″ between the under band and overbust measurements. This would mean that you are then a C cup, and the bra size you require would be 32C.

Please note:
This is a rough guide to be used as a starting point to calculate your bra size and therefore is not 100% accurate. We recommend that you familiarise yourself with a brands sizing, as all brands follow different methods of sizing. You can vary in size dramatically depending on what brand you wear. These sizes tend to run quite standard in relation to other brands. If you have any enquiries regarding sizing please email