Bra Sister Sizes
Sister sizes are bras that share the same cup volume but differ in band and cup measurements. They are helpful if you’re between sizes, feel a bit of discomfort, or struggle to find your perfect fit. With sister sizing, you can adjust the band or cup size while keeping the cup volume consistent.
| Sister size down | Your size | Sister size up |
| – | 65C | 70B |
| – | 65D | 70C |
| – | 70A | – |
| 65C | 70B | 75A |
| 65D | 70C | 75B |
| – | 70D | 75C |
| – | 70E | 75D |
| 70B | 75A | – |
| 70C | 75B | 80A |
| 70D | 75C | 80B |
| 70E | 75D | 80C |
| – | 75E | 80D |
| – | 75F | 80E |
| 75B | 80A | – |
| 75C | 80B | 85A |
| 75D | 80C | 85B |
| 75E | 80D | 85C |
| 75F | 80E | 85D |
| – | 80F | 85E |
| 80B | 85A | – |
| 80C | 85B | 90A |
| 80D | 85C | 90B |
| 80E | 85D | 90C |
| 80F | 85E | 90D |
| 85C | 90B | – |
| 85D | 90C | – |
| 85E | 90D | – |
| – | 90E | – |