How bra stores seem to think things work:
Anything smaller than a C cup: must be pre-pubescent. Ugly patterns, and colours. Lots of animals and stripes.
C to D cup: A woman! Pretty lacy things, nice patterns, large variety.
Anything over a D cup: Beige. Lots and lots of beige.
Well, and let’s not forget:
Most things over a DD: For your boobs to be that big, you must have tons of money. Only super-expensive bras for you!
For those with a smaller band size and a larger cup size or with a larger band size and a smaller cup size: Yeah, you don’t exist. Nobrasforyou.