Reviewed
38D vs 40D
40D is bigger than 38D. The cup letter is the same, but cup volume grows with the band, so 40D's cups hold more as well as having the longer band.
Side by side
| 38D | 40D | |
|---|---|---|
| Relationship | Same cup letter, different band | |
| UK | 38D | 40D |
| AU | 16D | 18D |
| EU | 85D | 90D |
| FR | 100D | 105D |
| Underbust | 38–39 in | 40–41 in |
| Bust | ≈ 42 in | ≈ 44 in |
| Cup volume | 40D holds more | |
On the size chart
38D is marked in ink and 40D is outlined. The yellow diagonal through 38D 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 38D or 40D bigger?
40D is bigger than 38D. The cup letter is the same, but cup volume grows with the band, so 40D's cups hold more as well as having the longer band.
Can I wear 40D if I'm a 38D?
Only if the fit check says so. Changing the band also changes the cup volume, so try both where returns are easy.
What are 38D and 40D in UK sizes?
38D is UK 38D and 40D is UK 40D. In Europe they are 85D and 90D.