I recently bought a camel trench which had a faux fur removable collar. I removed it from the coat because personally I didn't really like it. A couple days later however, I thought it would be a great headband.
I didn't want to do anything permanent in case I do end up wearing it on the coat, that's where the button holes come into play.
In my craft stash I found two buttons that fit into the button holes and I cut a piece of elastic that I could string the buttons with.
I added a quick knot tying the buttons together.
Placed the buttons through the buttons holes on the collar and voila!
My new Davy Crockett-esque headband to wear on extra cold days.