geisha's zashiki party dress
A specific type of kimono worn by a geisha when attending a zashiki (traditional banquet) party. The term is niche and primarily used in contexts related to geisha culture.
See also: 座敷
The geisha changed into her zashiki party dress and headed to the banquet.
Compound of 座敷 (zashiki, 'traditional Japanese banquet room') and 着 (ki, 'clothing'). The exact historical derivation is uncertain, but the term straightforwardly describes attire for a zashiki setting.