Not all surgeons require a compression vest after surgery, or some for only a short time. I have my gynecomastia patients wear a compression vest 24/7 for 6 weeks. The vest may be bulky, and a little uncomfortable, but is necessary for the healing process. It should be worn snug, but not tight.
Dr. Miguel Delgado recommends the vest be worn 24/7 for 4 to 6 weeks, depending on how the patient is healing. The vest should only be removed when showering. It is recommended to have 2 vests so that you can rotate them while one is being laundered.