I've got a bit of a 'do' to go to soon. It's black tie, so ideally I'd like something floor-length or 3/4 length. I'm size 12 and got dark hair/pale skin so the 'winter' colours of dark red, blue, green, purple suit me. Struggling to find something I like. Willing to spend up to £150 on it. One key point - after having bf'd 2 DCs I can't really do strapless, so I'd like to wear a bra underneath it. Any ideas?