I had the same problem with my Nikons, but found the fix by purchasing an M7 last year ;-)
Some time ago, I was looking for leather cases for my Nikons (FM3A and F3HP). For the F3HP, I settled on Nikon's own reddish eveready case, which if not supple leather, feels pretty good and form-fits the HP finder. Never found anything really nice for the FM3A, but sold the camera anyway.
Did Canon make a dedicated case for the F-1? You might like it if you found one.
I think you'll find the general consensus among SLR users here is that they carry their cameras around wittout the restrictions of a case. Good luck.