xiao guan (headdress)
Xiao Guan (lit. small Guan) is an informal Guan (chinese headwear for men) which covers the topknot of hair and secured with either hair stick or chin strap. It come in various shapes, as long as it is the size fitting to that of a topknot.
Xiao guan that resemble crowns are also called shufa guan, and in Korean, sangtugwan.