I heartily disagree with nylon use on guitars as it reacts with certain finishes.

The way to use leather is the way Martin used to. A single strap about one inch by eight inches with standard strap type hole/slots in each end. The topmost tuning pegs on each side of the headstock slip into the holes and the strap then becomes a hanger. No knots, no tools, and assuming the tuners are secure, perfectly safe. I use one on my lapsteel. The Martin ones were simple and marked with their insignia but an old belt will make several. Such a hanger can be left on the guitar permanently as it does not impede the case, playing style or appearance.

Peace, Mooh.

Several homes in my town have the wood hangers I make (mentioned above), which obviously will work with the leather strap idea.