This is one kind of weird advantage of living in MA. For the average MA inmate, the idea of someone carrying doesn’t even enter their heads. During the colder months I always carry a P229 OWB under a vest or sweater. I’ve lost count of the number of times the gun has either printed or been exposed and absolutely no one has noticed. As a new LTC owner carrying for the first time, you're more likely to be noticed for constantly checking you gun to see if it is still concealed or is even still there. Just ignore it, everyone else does.
We all carry, so we're aware that people carry.
Most people here haven't the faintest clue that anyone around them can or should have a firearm, so they would never bother looking for it.