The Underwire
Bra 101 10 min read
Bra Sister Sizes: The Secret Every Woman Should Know
Key Takeaways
- Bra sister sizes share the same cup volume with a different band size, so a 34C equals a 32D or a 36B.
- Sister size up when your band is tight on the loosest hook, and sister size down when it's loose on the tightest hook.
- If your band fits but your cups don't, change only your cup size instead of switching to a sister size.
- Stay within ...
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October 17, 2026 9 min read
