What is the ring on the chest of Hanfu?

The circular ring on the chest of Hanfu is a "square-heart curved collar", which is an ornament made of white Luo on the collar of Korean clothing in Song Dynasty. The upper circle and the lower circle look like a wreath, which embodies China's world outlook and cosmology with ancient times as the core, and has the ancient design characteristics of "learning from foreigners".

Since the Han Dynasty, officials have lined the outer collar with a round neck, which is called "curved collar" or "detained collar" in order to make the royal clothing more intimate.