Đinh Tự
Mũ Đinh Tự (chữ Hán: 帽丁字), also known as mũ chữ đinh, mũ Nhục, is a type of hat with the shape of the letter Đinh (丁) was a type of hat worn in Vietnam throughout the Lê dynasty and fell out of favor in the 19th century. It used to be widely worn by gentlemen and military officers.