This Kim Jong-woon / Yesung fan-art contains
hip boot and thigh boot.
There might also be
jambes nues, collants, pantalons moulants, skintight, pantalon skintight, pantalon collant, collant, jambière, leging, revêtement de la jambe, legging, couvre-jambes, revêtement de jambe, collants, justaucorps, and léotards.