Thanks for making coffee come out of my nose.Other than the self appointed PRINT PATROL tards on the interweb, people just don't notice 99.9% of the time.
You're right, though. It's amazing what most people don't notice. I'm not strutting around in a Glock Perfection hat and a "Protected by S&W" shirt, so nobody really notices me. It's unlikely they're checking out my svelte figure enough to notice a bulge at the waist.
Even if they do, what's to say it's not a telephone, tape measure, pager, or any of the cornucopia of other junk people lug around on their belts these days?