A little black dress (LBD) is a black evening or cocktail dress, cut simply and often quite short. Fashion historians ascribe the origins of the little black dress to the 1920s designs of Coco Chanel and Jean Patou intended to be long-lasting, versatile, affordable, accessible to the widest market possible and in a neutral colour. Its ubiquity is such that it is often simply referred to as the "LBD".
The "little black dress" is considered essential to a complete wardrobe by many women and fashion observers, who believe it a "rule of fashion" that every woman should own a simple, elegant black dress that can be dressed up or down depending on the occasion: for example, worn with a jacket and pumps for daytime business wear or with more ornate jewelry and accessories for evening or a formal event such as a wedding or a ball. Because it is meant to be a staple of the wardrobe for a number of years, the style of the little black dress ideally should be as simple as possible: a short black dress that is too clearly part of a trend would not qualify because it would soon appear dated.