Wiktionary
cup size
n. the size of that part of a bra that holds the breasts
Usage examples of "cup size".
Would help if the goddamn commlink didn't ping every two minutes with someone wanting to know Jami's goddamn cup size.
I won't compare cup size: at least I had them beat in that capacity.
And we have these lacy little blue briefs, and the matching bra, about a B-cup size 34 I would judge, excellent quality and unlabeled, possibly from a custom house.
It wasn't a perfect fit, but a hell of lot more comfortable than the old Air Force one, which had been one cup size too small.
On top, carefully folded, lay a snowy white silk shirt and white silk pants, two pairs of white silk bikini panties, and two matching lace bras, their cup size quite small.