also: たちえぼし
noun
upright eboshi; tall eboshi hat
A type of formal black-lacquered court cap worn by Heian-period nobles, distinguished by its tall, upright shape. Often associated with ceremonial or official attire.
See also: 烏帽子
平安時代の貴族は、儀式の際に立烏帽子をかぶった。
Heian-period nobles wore the upright eboshi during ceremonies.
I saw a real upright eboshi at the museum.
烏帽子 is the general term for the black-lacquered court cap; 立烏帽子 specifically refers to the tall, upright style, as opposed to other shapes like 折烏帽子 (folded eboshi).
Compound of 立 (tate, 'standing, upright') and 烏帽子 (eboshi, 'court cap'). The reading たてえぼし reflects a common euphonic change from たちえぼし.