Some of the padded nylon holsters had a single metal clip like that to attach them to the belt.
I have been known to remove the clip, insert on the other side of the holster and then wear it IWB.
I've never been comfortable wearing an OWB style holster except for the Roget's pancake holster I carried my Colt Combat Commander in back in the early to mid 80's. I also tried the cross draw holster for the Colt but ended up putting it on my back, the few times I used it, vs. in front.
If I was going to open carry a pistol (except here at my house/property) I'd be carrying a rifle, too. Easier to butt stroke someone trying to lunge for your pistol than to wrestle with them.