In postoperative radiotherapy for breast cancer, the upper half of the body is not allowed to wear clothes, because if clothes are worn, the patient lying inside the radiotherapy fixation device will feel particularly bad, which will affect the accuracy of radiotherapy. Therefore, the upper body of postoperative radiotherapy for breast cancer generally does not wear clothes, but can wear tight shorts or tight clothes such as five-quarter pants; there is also the upper body of postoperative radiotherapy for breast cancer, generally does not wear clothes, because the patient has a lot of body lines, which need to be used in the process of radiotherapy positioning. If the patient wears clothes, it is not conducive to the alignment of these body lines so that accurate radiotherapy can be performed. Therefore, the upper half of the body is generally not clothed in postoperative radiotherapy for breast cancer.