I used contact cement....put cement on both pieces to be put together give it about 15 minutes and stick them together. Be ready because once stuck they are STUCK!!!
Trace out your sheath on to the skin and cut it out first. Them go back and stitch it through the stitching holes in the sheath. If you are making it from scratch, draw out your sheath and skin a bit bigger than wanted, glue them together and cut to shape. Them punch the stitching holes and stitch it together. After stitching trim the sheath and seal the edge. Bees wax works well for this. Pat