I just recently bought a Galco 'Classic Lite shoulder system for Sig P226, P220, etc' it fits my Tanfo Witness Polymer-frame like a glove. It was almost right away that I fell in love with it, after wearing around the house and getting it adjusted just right.
For 'winter' carry, it's one of my go-to rigs. Conceals decently under a simple zip-down sweatshirt, super comfortable, don't dig or pinch anywhere. The only 'upgrade' I'm doing with mine is adding a double-mag carrier to replace the single, got one coming from Falco Holsters (they do custom work). It'll be a horizontal-draw for spare mags rather than vertical as well.
Sure I used to share the same phobia that many comment about: "Bro you're flagging everyone bro!"
It's really a non-factor if you practice proper draw technique and use a dependable firearm. For the most part, Joe-public doesn't see/know you're carrying anything, so that don't matter. The only time you could potentially 'flag' people is during the draw, this part is the most upsetting/unsettling for most. If you have your own private range to train on, that would be a good place to practice drawing from concealment. Otherwise on most public ranges, probably not going to be able to do live-fire draw.
But in reality, people carry guns in bags, fanny-packs, purses, etc. With the guns facing horizontal "FLAGGING EVERYONE BRO!"... It's a concern, but nothing to live in morbid-fear over. Just practice drawing a bit, get used to the thumb-break style holsters. And if you want even more extra 'safety'; carry a gun with a manual safety and a double-action trigger. I know this goes against the hive (Glock 19 solution for everything), but a quality double-action (DA/SA) with a good ambi-safety is a solid choice.