It's been a while since I've read this thread but since everyone else is posting how they improvise their Fenix lights I figured I would too. I didn't like the way it hung off my caps bill so I nixed that idea pretty quick. I'm going to have to try the shoulder strap setup – I like that! Anyway, here's mine.
It's not the most effective since it wants to bob around a bit but it works better than clipped to a hat IMO.

