I never liked hat hangers with the knobs or pointy bits because they leave a little dent in felt hats. This one fits those little 3M velcro wall strips perfectly.
Print -> Stick -> hang hat
I went with 10% fill because hats are light.
The next time I print these I would add a little more steepness on the angle of the "tail". It drooped a little bit without supports but overall finished looking pretty good so I lef it alone and printed 4 as a batch. I'll upload another file next time I revise it.