It's no secret that the Met Gala is the world's most fashionable theme party. Before the Met Gala takes over the Metropolitan Museum of Art tonight, take a look back at ten Royal Blue Slim Fit Velvet Men Suits 2 Pieces Prom Party Outfits Floor Length Royal Blue Evening Prom Party Dresses Promfy Vintage Royal Blue Cobalt Blue Evening Dress with Gold Beads and Crystals, One Shoulder Sleeves, Pleats, Satin Fabric, Perfect for Prom, Formal