What was the ancient school uniform called

The name of dickey originates from the poem "Poetry Classic - Zheng Feng - Dickey", which means "Green dickey, leisurely my heart", meaning a deep garment with a green collar worn by ancient schoolchildren, which had a slanted collar and was connected to a jade pendant, and was therefore called a dickey, and because of the green color of the garment, dickey became a pronoun for ancient schoolchildren, and the school uniform got its name from it.

Lanshirt describes the characteristics of the ancient schoolboy's clothing, which was a popular garment among the schoolboys during the Tang and Song dynasties, where the upper garment and the lower garment were combined into one long robe.