What do football players wear under their uniforms?

Protection and clothing you would find on a football player would include a helmet with a face mask and chin strap, mouth guard, shoulder pads, collar pads, neck pad or roll, forearm pads, a flak jacket or some sort of rib protection, hip pads, a girdle over an athletic supporter and cup, tailbone pads, thigh pads, knee pads, and cleats. Over all this padding would go the jersey top and pants.