I think these are pretty nifty. You have to keep clicking on photos and hyperlinks, however, to get to a place where you see someone actually wearing the thing. Looks as if it could fit nearly any rangefinder camera, not just a Leica M.
Here's a link direct to the manufacturer's site:
http://www.wotancraft.com/home.htm I love the written description, how the phrases give the clue that it wasn't originally written in English...

Being a super-cheap bastard, I might look into having a knock-off made, if the seamstress I know can stitch leather.