I've heard of this before, but what does it mean?
Girls, What exactly are bra sister sizes?
What Girls Said 2
Bra sister sizes are just bra sizes that will feel basically the same as the one you have (from what I understand of them). It gives you more options - so say that you're a 34 D cup, but the bra you want is only available up to a C cup. Rather than just not being able to have the bra, you can try out a 36 C instead and it'll probably fit you fine.1
Never heard of it either. O. o
Maybe 34 D is 32 DD? Not sure...0
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