Gentlemen, too, if you wear’em.
Click on this magnificent bundle of bra-related links.
Take a look at the links involving fit.
Check the picture examples.
If your bras fit like any of the bad examples, go get professionally fitted at a fancy ass bra shop. If you’re in Kansas City, I highly recommend Intimate Designs. They will help you find a properly-fitting bra and they will even provide free alterations to help improve how the bra fits.
I recently tried out Clair de Lune and they seem to be pretty good. There’s a decent selection fitting a wide range of sizes.