I just finished making a sheath for the Mora Belt Knife that I made a couple of months ago. I first made a paper pattern then traced it onto the back side of the leather. After cutting the piece out I wrapped it around the knife using small clamps to keep it in place. Wrapping leather around a knife is a bit trickier than I originally thought. You have to take into account the transition from the flat blade to the wider and rounded handle. When I was satisfied with how it looked I used contact cement to glue a third piece of leather in between the outer cover, along the edge where the stitches were to go. This extra piece will protect the stitches from being cut by the blade. The whole thing was stitched together then Sno-Seal finish was applied at the very end.
I used Sno-Seal to water proof the leather. Sno-Seal is made from bees wax and is nontoxic.
I used 4 - 5 oz leather, a heavier leather could have been used but I wanted to keep it as light as possible.
The snap closure in the front allows the sheath to be added to a belt without having to remove the belt in order to thread the sheath on.