I think it depends on where you live. Here vest and western wear are not that suspious. I have worn vests (not usually the photog vests) for years. Recently I certified a friend for his CCW and as we were talking he stated he had never realized that I was carrying. But then with cowboy boots, jeans, etc. the vest doesn't look out of place.
" A man to continue breathing, must be alert at all times. If not someone, sometime ... will sneak up behind him and beat him to death with a sockful of shit."
General George S. Patton Jr.