A woman's dress, usually with a close-fitting bodice and a long flared skirt, often worn on formal occasions WordNet 3.0 & Open English WordNet

A gown, from the Saxon word, gunna, is a usually loose outer garment from knee-to-full-length worn by men and women in Europe from the Early Middle Ages to the 17th century, and continuing today in certain professions; later, the term gown was applied to any full-length woman's garment consisting of a bodice and an attached skirt. Wikipedia

Loose outer garment by men and women from the early Middle Ages to the seventeenth century, or any woman's garment consisting of a bodice and attached skirt. Wikipedia Disambiguation

Full-length woman's garment consisting of a bodice and attached skirt, worn from the Middle Ages to modern times Wikidata

A loose wrapper worn by gentlemen within doors; a dressing gown. Wiktionary