As an exercise to learn openscad I created a closet rod bracket for my daughters closet.

The funky thing being that one of the walls was on an angle (i.e: not at 90 degrees to the rod).

The scad file has parameters for the various dimensions and for the angle off 90 for the rod support.

The measurements for the .stls are probably not correct for you, so:

1. Measure the size of your hanger rod.
2. Edit the .scad file in OpenScad making the appropriate parameter change
3. Generate the .stl
4. Print
5. Mount in your closet
6. Enjoy keeping your clothes off the ground!