What's the name of the thing stuck in the hat?

The top scholar and the traditional fable model of Han nationality. During the Ming and Qing Dynasties, the number one scholar symbolized the fame and fortune of senior officials. The pattern is mainly composed of three children. The middle child held up the crown and helmet to show that he had won the first prize, while the other two children celebrated with wishful good news. Their work used to be an ordinary civilian hat. Official uniforms originated in the Eastern Jin Dynasty, but as a part of official uniforms, they began in the Sui Dynasty and flourished in the Tang Dynasty. In the Song Dynasty, they added "wings". After the Ming dynasty, their work officially became synonymous with being an official.