For years I painted on the side inside peoples homes. I always carried under a un tucked t shirt. It was spotted a few times. A couple of times the person seemed a little shocked at first but after thinking about it a minute and finding out my partner was carrying also, and that they had been around us all day or several days,they were ok with it.
Most of the time the people were working for either knew us or knew of us through other people so that may have made a difference and were working for our selfs so we did not have to worry about getting fired by the boss. I guess we could ave gotten fired from the job were working on but it never happened. Who wants their house half painted?