## 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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