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|"I just want to carry a little fixed blade knife in my pocket."
You need a "Pocket Slick."
A simple blade cover that's custom formed to fit your knife. A leather sheath can slip off leaving you with a razor sharp edge waiting to find something to cut. The "Pocket Slick" is just tight enough to stay in place protecting you and your pants.
I also include a small hole in the "Pocket Slick" for attachment of a lanyard so you can carry the knife like a watch fob. It's inexpensive but works like a Million Bucks.