This isn't going to help getting people to leave their stuff
I always travel in a 'uniform' now, i.e. a large-pocketted "safari" shirt, which carries most of the stuff that I consider indispensible, can't 'wear' my computer of course, but apart from that anything in the overhead locker is just 'stuff' - and can be replaced.
I may look like a dork, but what the hell, everything I own is a tool, not a fashion statement - who cares.