In the process of attempting some fork snails, this idea came to me. My forks wouldn't bend like I wanted them to, and when I looked at the mutilated snail, I somehow saw a hook out of it all. This is how I did it.
The concept is that the teeth go down over the nails, nails acting as a fulcrum, and torque created by your coat pushes the teeth against the wall, holding it all up.
Step 1: Materials
All you need is a cheap fork (I bought a four pack at the dollar store) and a vise. To hang them up, two nails are required.
Step 2: Bending
I started by clamping the teeth of the fork into the vise and working my way down. There isn't a lot of instruction involved, my fork was cheap enough that i could bend it by hand. Just follow the pictures for the basic shape.
Step 3: Installation
Hanging the hooks up is pretty straight forward, just put two nails in between any of the teeth. I suggest nailing one nail in, pushing the fork onto it, and then adding another to stop it from spinning.
The photo below shows how I installed it onto a piece of wood, just to test it...I haven't put any on my walls yet. As you can see, this one easily supports my sweatshirt.