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 |
| – | 30C | 32B |
| – | 30D | 32C |
| – | 32A | – |
| 30C | 32B | 34A |
| 30D | 32C | 34B |
| – | 32D | 34C |
| – | 32DD | 34D |
| 32B | 34A | – |
| 32C | 34B | 36A |
| 32D | 34C | 36B |
| 32DD | 34D | 36C |
| – | 34DD | 36D |
| – | 34E | 36DD |
| 34B | 36A | – |
| 34C | 36B | 38A |
| 34D | 36C | 38B |
| 34DD | 36D | 38C |
| 34E | 36DD | 38D |
| – | 36E | 38DD |
| 36B | 38A | – |
| 36C | 38B | 90A |
| 36D | 38C | 40B |
| 36DD | 38D | 40C |
| 36E | 38DD | 40D |
| 38C | 40B | – |
| 38D | 40C | – |
| 38DD | 40D | – |
| – | 40DD | – |