Party Dress part 2

I posted earlier about my search for a lovely Black Tie party dress, and I thougt that I bought a lovely one but guess what happened...

This weekend I received my purple party dress... Unfortunately it is not as pretty as it looks on this image. So I will send it back to the webshop. Any suggestions where I can find some lovely 'Black Tie'   dresses on the web? Thanks for your help. The Gala is planned on the 20th of March so I need to hurry up a little...