The operation must be strictly sterile, and the patient's clothes will have bacteria. In order to avoid the infection of the patient's incision, it is necessary to take off the clothes brought from the outdoor environment of the operating room, and the medical staff will cover the body with sterile cloth to expose the part of the body to be operated. Moreover, when the operation requires extensive disinfection, the patient can't meet the disinfection requirements when wearing clothes, which increases the risk of infection.