It's an absolute truism in the CCW community that if you wear a covering vest of some kind, especially one festooned with pockets, then every member of The Great Unwashed will divine the fact that you are carrying a pistola. This view is so entrenched that the garments are frequently referred to as "Shoot Me Vests".
I think most folks give entirely too much credit to the perceptive abilities of their fellow h. saps.
I was in line at my local inconvenience store the other day, waiting to pay for petrol and cancer sticks, and dressed to go to work. I was wearing a black 5.11 Shoot Me Vest, so as not to spook the straights with the pistol on my hip. I was wearing a Coal Creek Armory baseball cap, Adidas GSG-9 boots, and a black nylon rigger's belt. I was sporting a T-shirt from the local DOE SRT team, complete with butch-looking logo and lots of hooah-sounding Latin over the left breast. I was idly twirling my keychain, which is a Monadnock Persuader, and the pocket clips of knives were visible in both my front jeans pockets. I was wearing Wiley X SG-1 shades, fergawdssake, and the guy next to me in the line looks at me and, in an attempt to chat me up, asks...
..."Are you a photographer?"
"No, sir, I'm a tactical poser."
This answer left him puzzled, and so he plowed on in an attempt to land a date by regaling me with his days as a photographer for his college paper.
I'm beginning to think that you could walk through the middle of the mall with a neon-pink STI Open Class racegun in a drop thigh rig, wearing a tee-shirt that says, in four inch fuschia letters "I AM CARRYING A GUN", and maybe one in ten people would pause their cell phone conversations long enough to notice...