Use only one hanger for two piece outfits. Hang the shirt first, then turn the hanger over and pin the waist of the pants to the back of the shirt at the shoulder seams. Do not pin second pieces (pants or skirts) under a jacket or shirt where they cannot be seen.
Pin pants with two safety pins at the waist. One pin will go on each side of the hanger's hook. The pants can be seen fully, front and back by simply flipping the hanger over and will not constantly fall on the floor.