I just got a clip-on light meant to clip onto the rear of shirt collar (was free from an event). I clipped it onto my left pannier on the back. It is not aimed (just hangs there), however i am thinking of other places it could clip to and be kinda self-aiming like the rear cinch straps, or the small cargo net which sits below the lower of the 2 straps. Maybe you could do this kind of thing vs on your clothing?

- Andy