Iv been considering a shoulder holster because everything else just seems to show on my frame. Im about 6'1" and 170 pounds and anything around the waist sticks out like a sore thumb. During the winter im almost always in an oversized Carhartt and have been thinking about trying a shoulder holster.
Actually, there's a 'variation' on the non-belt holster theme (whether OWB
or IWB) that's
not a true shoulder holster: it's the
center-chest holster.
Most center-chest rigs have adjustable straps like shoulder holsters, but the holster itself is positioned either dead center (mid-thoracic/sternum area), or slighter lower and a bit left (for a right-hander), thus giving you a very slight cross-draw effect.
Although 'open carry' while in the deep dark boonies appears to be the default carry-method that C-C rigs were designed for, you
can run them concealed
if you dress for it. While I wouldn't try doing it in hot summer weather, in cool fall weather with a jacket, and certainly in cold winter weather with an overcoat, a C-C rig is concealable. Certainly no worse than a SH.
When I was looking at C-C rigs for my 10mm Glock 40, I looked at the Kanai, Galco (Great Alaskan), and the Diamond-D Alaskan Guide models. The Galco & Diamond-D are leather; the Kanai is Kydex. The Kanai is probably the 'lightest' of these rigs, and the maker offers it in
a lot variations to fit whatever handgun you have. Diamond-D offers a lot of variety as well, especially for the magnum-revolver crowd.
I ended up with the Galco GA rig since it was on sale and there was also a discount on the spare mag carrier which fits on the cross strap. I can carry 15+1 in the G40, with another 15-rd mag within reach. While this particular gun and C-C holster set-up is for a dedicated 'woods gun' role, the Galco also fits my G20, and will likely fit my G29 too, although I haven't tried that one yet.
If the idea of a SH riding under your armpit all day isn't for you, but you're not happy with the choices in belt-holsters for a particular gun either, you might want to look into the center-chest holsters.