Cocktail Dresses are formal dresses used in the evening for attending cocktail parties. Traditionally, hemline lengths for cocktail dresses are usually knee length but its also dependent on your event and local custom. While the Little Black Dress is an easy choice for any party, you can choose from a variety of dresses that will show off your own unique style. Why not shop for a dress style in a bold color that you don't normally wear or pick a shape that will enhance your curves?