new party dress

[xJx]

I'm going to my boyfriends grandaparents 50th wedding anniversary party next weekend and would like a nice new dress to wear along with some new shoes. Before the party they will b renewing their wedding vows. I dont want anything to tarty but I want a dress which will bowl my bf over. Something sexy yet appropriate. Any ideas where I can find something online or has anyone seen anything nice whilst out shopping lately? xxx