Sister Bra Sizes: Guide & Finder
Sister sizes help you adjust band and cup to keep cup volume similar. Use the finder below to get suggestions.
How Sister Sizes Work
- Down band → Up cup (e.g., 34C → 32D)
- Up band → Down cup (e.g., 34C → 36B)
- Try 1–2 steps to fine-tune support and comfort
- Check brand variations and use our Bra Calculator for base size
Sister Bra Sizes Finder
Format: band+cup (e.g., 32B, 34DD). Letters only for cup.
Sister sizes adjust band and cup inversely.
Your Size