I also wanted to make it as painless as possible on myself, who wants to wrestle with hangars???
Step 1: A Door Hangar
I got the hangar from a store, attached to a pair of pants.
I took a piece of 1X8 pine (from the garage) and laid a hangar on top of it to get the outline. Then I just cut it out.
When I had the shape of a hangar out of wood, I cut the lower portion out of it. Then drilled two 1/8" holes in the sides. This made a place for the metal piece with the clips that I broke out of the plastic hangar.
OKAY....now let me give you lessons learned....make the cut out deep enough that you can actually pinch the clips to hang the pants. (I cut it once, then had to go back and cut it deeper.)
Step 2: Hang It!
I cut a piece of 1X4 so that it was about 2 inches wide, and about 8 inches long. I then cut this piece into one that was about 51/2 inches long, and the other was about 21/2 inches long. I attached them all together as you can see in the side view.
When it was together, I attached it with two screws to the top of the closet door.
It was a hollow-core door, so keep your screws toward the top 1 1/2 inches of the door and your will sink into solid wood.
I could have painted it, but it didn't really bother me the way it was.
The next time I build one of these I will make it out of cedar. I would also probably give it a little more standoff from the door by doubling up the 2 1/2 inch pieces behind the "hangar".