Back when I was working in a gun store, on Friday nights I and another employee would go to a well liked fish restaurant and have a late dinner. Did it almost every week.
Got to be friends with a very pretty waitress and after doing this for a year or more she came to the table one night and in a low voice said “I like it when you two come in, I feel safer.” And she looked at my waist where an N frame S&W was concealed.
I asked her how she knew. From the cloths we wore she knew we worked in the gun store down the street and she knew we were carrying.
Within a year she purchased a revolver from us and took training from a local woman’s shooting club.
I agree with others here that most people have their heads so far up there I-pods or cell phones that they wouldn’t notice a gun even when it was pointed between their eyes. But there are a lot of smart people that see everything.
"The difference between stupidity and genius is that genius has its limits" Albert Einstine