It is worth mentioning that usually carriers give themselves away by being overly self conscious or fidgety with their guns, regardless of size.
Confidence goes a long way!
Unfortunately in this world many people judge others on first impressions, which we know we shouldn't , but we/ they do. As s0nspark said " confidence"....
How a person appears in public . If you have an attitude like a dirtbag, look like a dirtbag, talk like a dirtbag and someone just happens to notice he has a gun, that's going to make the average person really nervous.
When I go to work I wear a polo, jeans, casual shoes and the clean-looking appearance. For about a week I did a little test to see how people react, I open carried for that entire week going to the same places that I usually do , only one person said something, and it was a guy that just asked if it was a 9 mm.
My point is even if people see a gun it all depends upon the person that's carrying and what they look like and if you carry in confidence they don't feel threatened. and then people just realize you're an average Joe, or even think that you're a Leo in plain clothes.
Again if you look and act like a decent average person, 99% of those people are not going to say a word.
And it said before , quit fidgeting with your gun.