gown

A gown, from the Latin word, gunna, is a usually loose outer garment from knee-to-full-length worn by people of both sexes 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. A long, loosely fitted gown called a Banyan was worn by men in the 18th century as an informal coat. Read more on Wikipedia