Yajin
Yajin (simplified Chinese: 压襟; traditional Chinese: 壓襟; pinyin: Yājīn), also known as shijian er (Chinese: 事件儿; pinyin: Shìjiàn er), is a type of Chinese accessory which is placed at the lapels of Chinese clothing (robes and jackets); they would typically hanged down on the right side (sometimes at the front depending on the clothing closure) of the chest area in order to press on the clothing. The yajin appeared as early as the Tang dynasty and became popular in the Ming and Qing dynasties.