So I ordered a dress from ideeli last week for our e-party that I just fell in love with, it was also reasonable & I had $25 off so it ended up being insanely cheap. Well it arrived & I hate it! It looks terrible on me & is so not what was show in the pictures online

The party is October 29th at my aunt's house.
I like dresses but I have big boobs so they're hard for me because I usually have to order up a size from what fits the rest of my body & sometimes that makes it look like I'm wearing a sack or a mumu (sp?).
I like black. I wear a lot of it. I don't like brown, I actually own nothing brown. I'm not big into bright colors & I can't really do patterns up top because they make my boobs like bigger which isn't something I'm into.
Thoughts/suggestions?