Gown

A gown, from medieval Latin 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, gown was applied to any full-length woman's garment consisting of a bodice and attached skirt. A long, loosely-fitted gown called a Banyan was worn by men in the 18th century as an informal coat.

Hero: The Guardian Smurf stories
A gown is worn by both Wonder and Smurfette whenever there is a special occasion taking place in the village, such as birthdays, weddings or anniversaries. It first appeared in the story "Hero's Hidden Talent", worn by Wonder when she sang a song to her fellow Smurfs. A gown was also worn by Smurfette for when she song her song for the talent show.