"The term is widely used in the British and American fashion media, and has been the subject of several popular television series. The term has come to refer to a collection of clothing that is composed of interchangeable items only, to maximise the number of outfits that can be created. The aim is to have an outfit suitable for any occasion without owning excessive items of clothing. This is usually achieved by buying what are considered to be "key" or "staple" items in coordinating colours."