Those that collect designer knives will know about some of the gorgeous leather sheaths many sell with their knifes. Not belt sheaths, these are thin walled, buttery soft sheathes meant for pocket carry of a small folder, with or without pocket clip. They don't have a zipper or other fastener, the knife slips in from the open end and is retained by friction. They add very little bulk to the knife (or light) and keep your treasure from being scratched by coins or keys. They're not cheap, but I'm thinking about one of these if I decide to carry in my pocket instead of on my belt.
I don't have a link, but most of the sites with high dollar hand made collector knives will have them.
- Larry