Been a while since I've been in the back acreage shooting. Life gets in the way sometimes. Busy season at work and a 19 year old daughter getting ready for her 2nd year of college.
Cooler weather finally and with a cover garment on at night, I'm starting to carry the Glock 48.
150 rounds today with some drawing drills and I'm pleased. I really like this pistol.
Why not carry it in hot weather? Prints a bit with just a tee shirt. I have the Kahr K9 Elite for hot weather and it disappears in a good IWB holster.
Thought I'd have a bit of a learning curve moving to the G48 but after a few shots, I was GTG.

You might shift to polo style shirts. I find the heavier material of a polo and its looser fit conceals my pistol better than a t-shirt. The polo may not totally replace your t-shirts, but its worth a try. When I suffered in the hot and humid Ohio summers, I wore a mesh polo and it worked pretty well.