While most people have heard of a black tie dress code, many still feel unsure as to what exactly it means. While men have strict requirements for their suits, the dress code for women is more lenient. To dress for black tie a floor-length dress or gown is the ideal outfit. While you can get away with formal cocktail attire, a long dress is more elevated for the occasion. Choose a sophisticated look with a simple and feminine silhouette in an elegant color.