Please can you help!?

I have a fancy dress party to go to and I wanted to go with my partner as the Shakespeare Romeo and Juliet when Juliet's family were hosting the fancy dress party! I think Romeo (Leonardo DiCaprio) was a Knight? And Juliet (Claire Danes) was an Angel? Does anyone know where I can get similar outfits from? Even if it's just the metal top bit of Romeos costume. Thank you xx