Measure 40 inches, 80 inches and 100 inches from the end of one 10-foot PVC pipe, making an indicator with a marker at each measurement location. Repeat this process with the second 10-foot PVC pipe.
Safely cut through one PVC pipe at each of these marks, using a handsaw. You now have four pipe pieces - two 40-inch pieces and two 20-inch pieces. Repeat this process with the second 10-foot PVC piece.
Sand rough edges from the pipe pieces using 100-grit sandpaper.
Attach an elbow joint to each end of one 40-inch pipe length. Fit a 40-inch pipe piece into the remaining openings on the two end elbow joints. You now have a U-shaped PVC piece with three 40-inch sides.
Fit a 4-way joint on the end of each 40-inch side of the U shape. The opening facing up on the 4-way joint attaches to the 40-inch length. The other openings are used to create the clothes rack feet. Insert the remaining 40-inch piece into the two 4-way joint openings that form a square from the U shaped piece. Set the square upright with the 4-way joints on the bottom.
Insert a 20-inch PVC length in each of the four remaining openings in the two 4-way joints. This creates feet that are perpendicular to the sides, providing stability for the clothes rack. Tap the feet into the 4-way joints using a rubber mallet.
Hang clothing across the top bar of the square rack.