Reviewed
40A vs 38B
40A and 38B are sister sizes: the cups hold the same volume. 40A has the looser band and 38B the firmer one, so pick by how the band feels.
Side by side
| 40A | 38B | |
|---|---|---|
| Relationship | Sister sizes | |
| UK | 40A | 38B |
| AU | 18A | 16B |
| EU | 90A | 85B |
| FR | 105A | 100B |
| Underbust | 40–41 in | 38–39 in |
| Bust | ≈ 41 in | ≈ 40 in |
| Cup volume | Same | |
On the size chart
40A is marked in ink and 38B is outlined. The yellow diagonal through 40A shows every size with the same cup volume.
A
B
C
D
DD
DDD
G
H
28
30
32
34
36
38
40
42
44
Read each size
Questions
Is 40A the same as 38B?
40A and 38B are sister sizes: the cups hold the same volume. 40A has the looser band and 38B the firmer one, so pick by how the band feels.
Can I wear 38B if I'm a 40A?
Often, yes. The cups hold the same volume, so the change you'll feel is the band: 38B is firmer. Choose by how the band sits, level and snug on the loosest hook.
What are 40A and 38B in UK sizes?
40A is UK 40A and 38B is UK 38B. In Europe they are 90A and 85B.