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