hat of invisibility
A magical hat from Japanese folklore that makes the wearer invisible. Often appears in stories alongside the 隠れ蓑 (straw raincoat of invisibility).
In old tales, when you put on the hat of invisibility, you become unseen.
There is a legend that tengu possess a hat of invisibility.
Compound of 隠れ (kakure, 'hiding') + 笠 (kasa, 'conical hat'). The exact origin in folklore is uncertain, but it is a well-known magical item in Japanese legends.