I dont really work hard at concealment. I'm 6ft tall, weighing in at a whopping 155lbs (fully dressed), and I carry a 5" 1911.
It not unusual to see me in a gun shirt (my peace through superior firepower shirt is my favorite). During the colder months, I wear Mechanix Gloves with the thumbs and index fingers cut off. Whenever I hold anything gun-like, I obey the four rules. Drills, impact wrenches, sawzalls, all get carried at low-ready.
I dont wear tacticool clothing. Most of the time, I'm wearing a tank top under a T shirt no matter how hot it is (one giveaway), jeans, and Altama boots, my second pair in seven years.
You'll probably see that I'm carrying. But no one else seems to notice, so I cant say that I care. Like previously mentioned, with the exception of CCWers, most people arent gonna notice squat.
Tell-tale signs to me are any type of clothing youll see advertised as "tactical." Take the entire 5.11 line. Photgraphers' vests. Two shirts in 90 degree weather. And carpenter's or painter's jeans (they give you a lot of room around the ankles).
I've made a very diverse group of people. From middle-aged men in german cars that looked like bankers, soccermoms driving minivans (okay, just one of them), and guys like me that dress like they barely make enough money to get buy, with a vehicle to match.
Have I been made? Probably. I'd be surprised if I hadnt. But they say the same thing to me that I say to them: nothing. A hello, or a nod, and thats about it.