Qing Guanmao (清代官帽) is a hat worn by Chinese officials during the Qing dynasty.
It is a round hat with a thick black velvet trim and a red top with a small button that can vary in size. A ribbon or something else could be attached to the top as well. Very often worn by jiangshi, in which case an ofuda is usually attached to the front.
Some characters usually seen wearing a Qing Guanmao are Lei Lei, Mei in her Jiangshi skin, and Shuten Douji in her Heroic Spirit Festival outfit.
This tag implicates hat (learn more).