What do you use? And where does the hook for the belt attach to…the gun body or the hose?
Okay, this is how it was done in the movies and this is how I do it.
First you have a leather loop on your belt, like this:

And on the bottom of you gun, you take a S-hook and twist the one hook so it’s perpendicular to the other. Then you crimp the other hook shut. You then put a washer on top of the crimped end and secure it to your gun body via a bolt. Like this:

Then you simply latch the S-hook on your gun to the loop on your belt, like so:

Not too hard.
Thanks. Off to the hardware store I go.