Backup Guide
How To Wear Your BackStory:
Sister Sizing
WHAT IS SISTER SIZING?
Your current bra size has “Sister Sizes” - alternate sizes where the cup volume stays the same even though the band size and cup letter changes.
FIND YOUR SISTER SIZE:
"Should I wear my Sister Size?":
Do your cups fit smoothly without gaps or spilling?
Your current bra size has “Sister Sizes” - alternate sizes where the cup volume stays the same even though the band size and cup letter changes.
FIND YOUR SISTER SIZE:
"Should I wear my Sister Size?":
Do your cups fit smoothly without gaps or spilling?
If your answer is “no,” your bra cups aren’t fitting you the way they should.
If your answer is “yes,” see the next question below.
Which hook setting do you use to fasten your bra?
Which hook setting do you use to fasten your bra?
If your answer is “the tightest hook possible,” your Sister Size DOWN just might work for you!
If your answer is “the loosest hook possible,” your Sister Size UP just might work for you!
If your answer is “one in the middle,” either your Sister Size UP or Sister DOWN just might work for you!
30 Band Size
| Sister Size DOWN | Current Bra Size | Sister Size UP |
| 28DD | 30D | 32C |
| 28DDD | 30DD | 32D |
32 Band Size
| Sister Size DOWN | Current Bra Size | Sister Size UP |
| 30D | 32C | 34B |
| 30DD | 32D | 34C |
| 30DDD | 32DD | 34D |
34 Band Size
| Sister Size DOWN | Current Bra Size | Sister Size UP |
| 32B | 34A | 36AA |
| 32C | 34B | 36A |
| 32D |
34C
|
36B
|
| 32DD |
34D
|
36C
|
| 32DDD | 34DD |
36D
|
36 Band Size
| Sister Size DOWN | Current Bra Size | Sister Size UP |
|
34B
|
36A | 38AA |
|
34C
|
36B
|
38A |
|
34D
|
36C
|
38B
|
| 34DD |
36D
|
38C
|
| 34DDD | 36DD |
38D
|
38 Band Size
| Sister Size DOWN | Current Bra Size | Sister Size UP |
|
36B
|
38A | 40AA |
|
36C
|
38B
|
40A |
|
36D
|
38C
|
40B
|
| 36DD |
38D
|
40C
|
40 Band Size
| Sister Size DOWN | Current Bra Size | Sister Size UP |
|
38C
|
40B
|
42A |
|
38D
|
40C
|
42B
|
*Sizes in pink are stocked by BackStory