I typically carry my Glock 19 in a paddle holster (OWB). I will admit that I keep my belt fairly tight, which is getting more and more difficult as my gut continues to grow outwards later in life. But I absolutely can't stand a loose belt because then the gun and holster will sag and flop around some. However, of the 20-some-odd holsters I own, the OWB is the most comfortable for me to wear. I can literally wear my largest gun, a Glock 19, all day long without any discomfort. In fact, it is easy to forget it is even there. Other holsters I sometimes use have what I call a "2 hour limit." After using them for 2 hours straight, they have to come off because they just aren't that comfortable.