Wikipedia
Sokutai
The is a complex attire worn only by courtiers, aristocrats and the Emperor at the Japanese imperial court. Parts of a sokutai are the , a flat ritual baton or sceptre, and a hat called .
No longer in normal use, the sokutai is however still worn by male imperial court members, including the Imperial family and government officials such as the Prime Minister on rare occasions, such as weddings and enthronement ceremonies. On such occasions women such as an empress or princess wear a jūnihitoe.