I want a dress to wear to dh's work Xmas party. The women at the party are mainly in two "types" and I'm not in either. There's the late 30's+ (most of whom have children) and then there's the early/mid 20's (who don't have children). I'm 30 with 2 children. So I'm looking for something that isn't going to make me look older but also isn't going to make me look like I'm trying to relive my teens 

I'm only 5 foot, my bottom half is a 16 and my top half is a 14 and I'm a 34FF so I have problems getting anything that fits me.
Oh and your max budget is £50