Bobbi,
So much depends on the style of your outfit, when I squeeze into bodycon dresses there isn't much space for boobs to to do their own thing. I made the mistake of wearing an underwired bra in my blue dress and did have some very sore rub marks. My boobs are only 36C anyway , part is natural and part is forms , as they sit in the bottom of my bra there is a nice movement without things getting out of hand . It's another reason why I don't like full forms, I lost all these benefits .