I'm going to a good friends 30th in a few weeks, it's a prom style, sophisticated(ish) themed party. Invite says formal wear is optional but must look fab!
I've looked online all day trying to find a dress, have found this & this
Neither of which are stocked in my size there and I don't have enough time to wait.
Can you wise lot help find me something along those lines or totally different if it will suit me?! 
I am size 6 & 5'1.
TIA 