Yeah...I hear ya ladies, but there is a solution. On EquestrianCollections.com, they have a bra that will garentuee no bounce. It's called the Enell No Bounce. It works wonders. I do not bounce and I have a big set of boobs. Buy it, you will not regret.
It tells you how to measure too because it isn't like buying a regular bra. I love them. They are tight when you first buy. Almost too tight, but they do loosen. Not too much to where you are bouncing around, but enough to breath. I have NO bounce at all. It's great.
They are expensive, but if it saves me from being punched in the face by my tit, then I'll buy anything.
Good luck...I'm going to buy two more for the riding season.
All I pay my psychiatrist is the cost of board, and he'll listen to me any day.