You can start wearing a hat two days after your hair transplant procedure without any problem – we do not see any harm in that. During the procedure, we do not make any sutures or staples to transplant the hair follicles. The hair follicles take about 72 hours to situate well on the scalp. During the first 72 hours’ post-surgery, it is best to keep the hair follicles from anything. They should not have any contact with anything, therefore, we advise our patients to wait for two days for wearing a hat.