How do you know that no-one notices?
I have been concealed carrying since way before we had concealed carry permits here in Missouri. I have had lots of practice at it. NOTE: I have both a Missouri CCW Permit as well as a Retired LE ID Card.
Between being a Reserve Deputy Sheriff, and a Police Chief I concealed carried for about 20 years before Missouri had CCW Permits.
I do own a full length mirror, and check to see how much I might be printing in different clothing.
I have several cover garments selected specifically to cover my firearm in different temperatures, and under different conditions. An example would be wearing a lite vest under a coat so that I could remove the coat say at Church, and still have my handgun concealed. I might have 2 or 3 different cover garments available in my vehicle to cover a day warming up while I am out and about.
I carry at 4 O-Clock in a holster. What holster depends on what I am carrying. Most of the time I carry a G23 in a custom leather IWB holster, with a high-riding double magazine pouch weak side at 3 O-Clock. I also carry 2"-3" K Frame revolvers at the same location. I carry my full size 1911 Colt once in a while both inside and outside the waist band.
With longer pistols such as the G35, which I do not at this time have an IWB holster for. I pay attention to the length of my cover garments, to make sure the G35 stays covered.
I have been the President of our local Sportsman's Club since 1986. People ask me questions about concealed carry, concealed carry classes etc. all the time. I have shown my holstered firearm to lots of people over the years asking for advice on ccw gear. You would not believe the number who have commented that they had no idea I was carrying.
NOTE: Showing your concealed carry handgun is not normally a good thing to do. Since I have been the Club President for ever, and I am the one who people get referred to about ccw classes, range use etc. I am in a slightly different position.
I would not Mexican Carry a Glock with one in the chamber. Get a hi quality holster.
Bob R