Bal costumes, or costumes worn to masquerade balls, can vary greatly in style, design, and level of formality. Popular synonyms for bal costumes include fancy dress, costume party attire, masquerade costumes, and cosplay. Fancy dress is a term commonly used in the UK for costumes worn to themed parties and events. Costume party attire is a more general term used to describe any costume worn to a party. Masquerade costumes can refer to traditional masks and attire worn to a masquerade ball or more modern interpretations of masquerade style. Cosplay, short for costume play, refers to costumes worn to represent a specific character or genre such as sci-fi, anime, or comic book heroes.