I'm a big guy so it's hard for me to CCW during the warm weather and at work, but on the weekends I'm good to go. Now that I have my NH non res it's easier since the wife and I pop over the border all the time.
I'm not huge, but I'm not small either (5-10" 215 lbs). The only tee shirts I can wear are XXL and I have a lot of Carhart short sleeve button down shirts that are XXLT. I usually leave the button down shirts unbuttoned and wear a wifebeater under them, unless it's windy, then I'll button the bottom two buttons.
I use a Serpta holster and nobody has ever noticed. Someday I'll breakdown and try a Crossbreed IWB. Almost a third of my co-workers carry and probably one quarter of my customers also carry, that I know of.
Last week I had a regular customer ask me to cut a board for him @ 8'. As I was walking down to the saw with him I got a phone call from one of our salesman. I put the board on the saw @ 8' while I was still talking on the phone and turned on the saw. He must've had second thoughts about the cut and went to grab where he thought my tape was. You should've seen his face. That's a gun, is that a Glock, is that a 9mm, do you need a permit to carry that here? I very calmly said "Yes, that's a gun, a Glock 45, and yes you do need a permit in this state to carry concealed and yes I have one for this state and several others". As I'm telling him this, I'm trying to hand him my tape, but he was completly enthralled. He said he never noticed that I carried and I told him it's always there.
I don't think he was upset, just surprised. I haven't seen him since but when I do I'll offer to show him my permit if he likes and offer to take him to the range sometime. He's a conservative self employed family man, I smell a potential convert.