Does it make sense to have a sheath made for the left side, if you CCW right hand? Is that how you carry a knife and pistol?

I have a (?)older,thick,crude, QuarterMaster(?) knife, unmarked, that has a left hand sheath. At first I thot it was for a lefty. Now I wonder if someone wore left hand sheaths if they were right handed and slung their rifle over their right shoulder. Make sense?