A medical undergarment system effective for supporting an ostomy system consists of a first diagonal catheter channel, a second diagonal catheter channel, a first vertical catheter channel, and a second vertical catheter channel. The system consists of tubing, a base undergarment, and a fluid bag. The medical undergarment system provides a comfortable yet stable ostomy system that can easily be slipped on and off by a user. The system enables convenient and easy removal of bodily fluid when using a catheter.