I agree with James on this one. Those hokey Tandy Leather tube holsters, seen so often at rendezvous, have very little historic support. A jacked leather gun bucket, with a flap, equipped with an added shoulder strap, would be more likely.
Thats why big old pistols, were referred to as horse pistols. Because they were carried on the horse, not the belt. Belt hooks were primarily found on sea service pistols.
Hungry Horse