What amazes me now days is on the internet, anyway, I see a lot of YouTube people, packing fairly large handguns, mostly 9mm, with light, and optic sight, in a pelvic holster under a tee shirt. That's great if you can do it. But I also, believe that a whole bunch of them are getting paid to promote all of this stuff. Companies need to advertise, and they have about managed to convince us, that all of these accessories are required, so you will feel compelled to spend a lot of hard cash, to acquire them.
Of course, companies love to sell us all manner of small pocket guns, too. They keep coming out with the latest and greatest of these, also.
Me, I have tried a fair amount of this stuff, and I keep coming back to a few tried and true pistols, all with iron sights. I carry a Colt Lightweight Commander in a Milt Sparks strong side holster, most of the time, but sometimes it's a Glock 19x or model 22, and if I feel the need to go smaller, I drop down to a Smith and Wesson Shield, and or stuff a J-frame 38 in my pants or coat pocket. I have others, but that covers 95% of my carry needs.
A good holster is about as important as the choice of gun you choose. I have found that I can carry the Colt Lightweight Commander in a Milt Sparks IWB holster, under a light shirt, nearly anywhere, even nonpermissive environments, about as easily as anything else. The Glocks except for the slim ones are a little harder for me to conceal. The J-frame of course is fairly easy to conceal.
I am seriously looking at the S&W 360 J-frame. less than 12oz. For the kind of weight 5 shot is not bad, anything close to this weight semi is only around 6 shot. You cannot beat the reliability of a revolver. 360 is just very expensive.