In fashion, a sheath dress is a type of dress designed to tightly fit the body. It is often made of a very light and thin material like cotton or silk, and rarely contains any flourishes. Unlike the shorter cocktail dress and the longer ballroom dress, a sheath dress typically falls around the knees or lower thighs, and can be either strapped or strapless. Some brands well-known for their sheath dresses include Ralph Lauren, Prada, and Marc Jacobs.