 It covers the arms and upper part of the wearer's body.The "jeogori" has been worn since ancient times and went by a variety of names such as "yu" (유, 襦), "boksam" (복삼, 複杉), and "uihae" (위해, 尉解) in the Three Kingdoms period (57 BC - 668 AD).Although it is unknown when the term "jeogori" began to be used to refer the garment, it is assumed to have appeared in the late Goryeo period around King Chungnyeol's reign.