Alright ladies, I'm really trying to figure out if i should do a bustier or not under my dress and what people's thoughts are. Im about 5'6" - 125 - and built like a swimmer (narrow waist, broad shoulders and ultimately - barely B's as I like to call my chest). My mom and I were talking and I asked her and she replied "why do you need one" and I didn't have an answer - soooo,...why do I need one? How uncomfortable are they? Do they really make THAT much of a difference? Thanks!