This green and gold costume is a type of traditional Chinese ancient dance costume, known as the "fan dance costume".
The costume usually consists of a long robe and a skirt with a fan-shaped hemline.
In ancient times, fan dance was a very popular form of dance, so this costume became a symbol.
People wearing this costume would perform traditional fan dance movements to showcase their dancing skills and artistic talents.
The design of this costume is also very exquisite, with its colors and patterns being very gorgeous, giving off an impression of nobility and elegance.