By Ben KellermanNEW YORK (Reuters) -Red, silver and blue ruled the Metropolitan Museum of Art steps at a youth-driven Met Gala on Monday in a celebration of the best of American fashion. There were show-stopping outfits from rapper Lil Nas X, wearing a Versace suit of gold armor and supermodel Iman in a stunning feathered gold and beige headdress and cage skirt as actors, singers, sports stars and social media influencers embraced the theme of "American Independence.