I think that I'm going to step right out and say that active lighting integrated into clothing just doesn't seem very workable to me. Sensors could be handy, I suppose, but I can't think of anything off the top of my head that I really need to be sensed while I'm on my commute. Hrm. Something that actually could be useful might be heated gloves and socks. I'm fairly certain that such things already exist, but it might be worth considering integrating heated gloves and socks with an outer wind layer, jacket or safety vest. Make the controls easily accessible and that sort of thing. Perhaps find some way to design lightweight, easily rechargeable/replaceable batteries into the system.

To be perfectly honest, I still don't think that I would buy such a system, but that's what I can come up with.