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Chengziguan (Hanzi: 程子冠) is a type of "guanmao" (冠帽), a men's traditional hat originating in China, dating back to the Five Dynasties and Ten Kingdoms period. It is said that this kind of headgear was usually worn by Chinese Song Dynasty philosopher Cheng Hao and his brother Cheng Yi, therefore it is called "Chengziguan", which literally means “the hat of the Cheng”. "Chengziguan" is made with horse hair.