What does the underskirt system mean?

During the Xia, Shang and Zhou Dynasties, the aristocrats of Huaxia nationality in the Central Plains mainly adopted the top-down-dress system, and the shape of the top was mostly cross-collared and right-lapped, with five primary colors, namely, green, red, yellow, white and black. The lower skirt is similar to the shape of an apron, and the waist is tied with a tie, and the lower skirt is made of intermediate color, that is, a mixed color mixed with positive hue. Small sleeve is the most common clothing for civilians, and the length of clothing is usually at the knee, while the waist is tied with straps. A stone statue of a slave owner unearthed in Anyang, Henan Province, wearing a flat hat, a right-handed collar, a skirt, a big belt around the waist, leg binding and pointed shoes. This generally reflects the situation of Shang Dynasty costumes. At the beginning of the Zhou Dynasty, system of rites and music made detailed regulations on the system of crown clothing for nobles and civilians, and the rulers showed their dignity and majesty with strict grade clothing.