The term 'Cotillion Girl' refers to a young woman who is part of a formal ballroom dance event. The term DEB, which is a three-letter acronym, is often used to refer to this type of girl. A Cotillion Girl is typically a high school or college student who is invited to attend a formal dance event, such as a debutante ball, and is expected to dress in formal attire and learn the etiquette and social graces associated with the event.