Reviewed
38DD vs 40DD
40DD is bigger than 38DD. The cup letter is the same, but cup volume grows with the band, so 40DD's cups hold more as well as having the longer band.
Side by side
| 38DD | 40DD | |
|---|---|---|
| Relationship | Same cup letter, different band | |
| UK | 38DD | 40DD |
| AU | 16DD | 18DD |
| EU | 85E | 90E |
| FR | 100E | 105E |
| Underbust | 38–39 in | 40–41 in |
| Bust | ≈ 43 in | ≈ 45 in |
| Cup volume | 40DD holds more | |
On the size chart
38DD is marked in ink and 40DD is outlined. The yellow diagonal through 38DD 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 38DD or 40DD bigger?
40DD is bigger than 38DD. The cup letter is the same, but cup volume grows with the band, so 40DD's cups hold more as well as having the longer band.
Can I wear 40DD if I'm a 38DD?
Only if the fit check says so. Changing the band also changes the cup volume, so try both where returns are easy.
What are 38DD and 40DD in UK sizes?
38DD is UK 38DD and 40DD is UK 40DD. In Europe they are 85E and 90E.