Wear a nurse's uniform. Cos means role-playing, which refers to the use of clothing, accessories, knives, makeup, etc. , and play various roles in animation, games or movies. People who play cos are generally called coser. Cos was put forward by Nov.Takahashi, which was originally formed for commercial purposes, and then gradually developed freely. Cos nurses refer to the costumes in cos, and non-nurse professionals wear nurses' costumes to play the role of nurses.