The other day I slipped on one of my fem cotton tops and went to town wearing one of my lace cup bras.
Happened to look in one of the store mirrors and thought that my natural boobs didn't really look that good (old age? LOL). As I was walking around that and a couple of other stores I noticed that many maybe most of the women I found attractive had on foam cup bras.
Came home and switched out to one of my foam cup bras and the girls looked perkier and more like the women that I had noticed.
A couple of things I've noticed. Foam cup bras don't usually make your boobs look much bigger, but do give them a rounder filled out look. Probably why VS sells mostly foam cup bras.
One last thing wearing a solid color stretch top makes your projection more noticeable, especially white.