I'm not entirely sure why everyone seems to have such a problem with this. I carry a full size Glock 17 with a 10 dollar nylon IWB holster that you can get at any Army/Navy store. All I wear are t-shirts (when not at work) and I have no problem. If you stop worrying about your gun "printing" on your shirt, you'll lead much longer lives. All that worrying will get you nowhere. Chances are, only 5% of the people walking around on the street actually would be able to "see" your gun "print". However, that's even if they're looking. And if they know, chances are they're a CHL. On top of that, who the heck cares??!!
I just see all of this worrying about printing and such to be misdirected and unneeded. I've seen countless amounts of people spending an incredible amount of money on these 90-100 dollar holsters when I have yet to see one that is any better than some simple nylon.
Who knows.....
Here is my 10 dollar rig....Except I don't use the thumb break, never have....
It is a pain to get off of my belt because of how strong the clip is, in case anyone is wondering...