Commodore Sheath on Hen&Rooster
How I use it
The pin keeps the knife from escaping, but is loose enough to move around. You do need a good belt.
You can see the leather sheath that came with the Laredo. Other than weight it's a great sheath for a fighting knife. The third knife is the Perrin Street Bowie with its standard knife sheath. It's tuckable too.
Just some examples.