Phốc Đầu (chữ Hán: 幞頭) is derived from the Chinese Futou (襆頭). It was formal wear for Vietnamese mandarin officials. It is the predecessor to the Mũ cánh chuồn or also called Mũ ô sa, which was derived from the Chinese Wushamao (烏紗帽).

Phốc đầu of the Nguyễn dynasty
Mandarin of the Revival Lê dynasty
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