Cherry SizeSister sizes: a similar cup volume, three sizes
A sister size is a bra size with about the same cup volume but a different band: go down one band and up one cup, or up one band and down one cup. For example, 34C has the sister sizes 32D and 36B.
The rule
- Band too tight? Take the sister size up: 75C → 80B.
- Band riding up, straps slipping? Take the sister size down: 75C → 70D.
- The cup letter changes; the cup volume stays close.
Find your sister sizes
| Band down (tighter) | Your size | Band up (looser) |
|---|---|---|
| 30C | 32B | 34A |
| 30D | 32C | 34B |
| 30DD | 32D | 34C |
| 30DDD | 32DD | 34D |
| 32C | 34B | 36A |
| 32D | 34C | 36B |
| 32DD | 34D | 36C |
| 32DDD | 34DD | 36D |
| 34C | 36B | 38A |
| 34D | 36C | 38B |
| 34DD | 36D | 38C |
| 34DDD | 36DD | 38D |
| 36C | 38B | 40A |
| 36D | 38C | 40B |
| 36DD | 38D | 40C |
| 36DDD | 38DD | 40D |
Why sister sizes matter when you shop
Two situations call for a sister size. First, fit: if a bra is perfect in the cup but wrong in the band, the sister size fixes the band while keeping a similar volume. Second, availability: many brands don't produce every combination, so knowing your sisters widens your options in the sale rack. The Cherry Size app shows your sister sizes automatically with every estimate.
Get sister sizes per brand in the app
Bra sizes by brand
How each brand writes its sizes, its recorded range and its conversions:
BravissimoFreyaPanacheSKIMSThirdLoveVictoria's SecretWacoal America
Your size, everywhere you shop
Cherry Size keeps your measurements on your iPhone, translates them into 617 brands, tracks changes through pregnancy, nursing or weight shifts (with a subscription) — and never uploads a thing.
Scan with your iPhone to download the appIn the app, your size is free, and so is your size at 3 brands you choose. Every brand, the fitting room, the wardrobe and the journal need a subscription, with a free trial for eligible new subscribers.
