Hello!
I got my dress at David's, and they recommended I get a size 2. I did, and when I tried it on, it felt too big, like it was slipping down my chest. I've attached photos, sorry if tmi.
I asked about getting a size smaller (0) and they said that that would be too small and that they are going to sew in a bustier that will keep the dress up. I don't want the dress held up, I want it to actually be smaller! I almost feel like they ordered up a bit on purpose to sell me alterations later.
How big of a difference is there between their sizes?

