I have average sized breasts, C, but have always found body protectors squashed them and have resisted wearing one for this reason. In November, I bought an Airowear Outlyne, which is shaped for women and I find it very comfortable. It does not attempt to flatten my breasts and I can take proper breaths, I even forget I'm wearing it.
The Kan Tec is also designed for women but it is quite expensive and heavy but it has gotten great reviews here in the past.
Airowear Outlyne. Had a Rodney Powell and wore it twice, I thought I possibly didn't like it because I had ridden for years without one so gave up.
Then after a couple of falls I decided to try again and although it took a a couple of rides to get used to it. It goes very soft when warmed up and I am happy to wear it all the time now.