Some BF leather benders, among others:
Azula Gun Holsters
Duramax
horsewright
Gary W. Graley
Sharp & Fiery
You could hit them up to see if one of them would make some leather pants for your knife. You may need to send the knife in to have the sheath made.
Outside BF, Google search is your friend. As is that auction site, Etsy, and Mr Bezo's emporium. You can hit up gun/outdoor shows to see if there are sheath makers there, if there are shows in your area.
HTH.