shoulder rigs
I think the interest in shoulder rigs has sort of run it's course and is on the decline these days. As noted, TV and film gave the shoulder holster a lot of looks, and shooters seemed to follow. I can recall several investigative/detective types from my past who used various SH's in the role with LE. Now, a couple of years retired, I can't recall seeing anybody in a rig for about the past decade or more, all strong side hip. Our biggest local PD had an episode where one of their detectives got in a struggle and lost, or nearly lost, his gun to a perp in an arrest.......the PD put the nix on shoulder rigs via policy shortly thereafter.
For a while, I had an upside down rig that carried a J-frame or similar in a clamshell arrangement that had a mild spring and was elasticized as well. It was useful for carrying a second gun under an outer garment or uniform dress jacket....the tiny J's and Charters served that role well. Seems like that old rig was a Safariland. It's harness was very simple, and the little revolvers were not any type of hindrance and concealed well.
I've got an Aircrew Holster, the WWII type, that is similar to the WWII Tanker holster, but in appearance is very similar. You can duck into it without the need for a belt or garment of any kind (there's a thought for you) and you can't say that for any waistband rig. I use it to carry a Ruger B-hawk, or a Smith M27 , it is useful for ATV in the mud, mountain bike (not so much these days) or when in and out of the 4WD on work days and so on at the hunt club. I'll also admit to using it with either revolver in a quick store run in the evenings, now and then, when dressed in sweats with no
belt or decent wasitband.