When you need to know, you go to the experts.
I'm looking for a sheath to fit 91mm size SAK's. Climber to Explorer.
Something like the Zermatt Pouch, that your belt goes thru. Not a clip on sheath, I would worry I might loose a clip on.
The Zermatt is nice but has an exposed rivet inside. It can be leather, nylon, cordura, snap close or velcro.