Princess Iron Mirror is wearing a flag python. The flag python originally refers to the imperial robe, which was used by Manchu empresses in the Qing Dynasty. This is one of the few costume prototypes preserved in the traditional costumes of Beijing Opera in the Qing Dynasty. Of course, it has also undergone some artistic processing. After becoming a costume of traditional Chinese opera, it lost the rules of historical dynasties, but was included in the track of the program, which was commonly used by aristocratic women of the ruling class of ancient ethnic minorities in China (so-called "fanbang"). When in use, it is lined with "collar coat" and externally hung with beads.