Smart Carry.
www.smartcarry.com
You can carry handguns that are a lot bigger than you might expect, and you can do it in shorts, without a shirt if you want.
Its also a lot quicker and easier to get to the gun, especially when seated.
I normally carry a Glock 26 with a 17 reload in mine. They are comfortable for all day use, and thats a long active day too.
If I could only have one holster, this would be it.