This depends on what procedures you’ve had done. Usually, a button up soft cotton shirt and elasticized sweat pants or pyjama pants are comfortable for patients who’ve had body contouring procedures performed. Try to avoid anything that you need to slip over your head, since you may not be able to, or advised to, lift your arms shortly after your surgery.
Loose fitting clothing that opens in the front and is easy to get in and out of will be the most comfortable. Good luck!