Re: CCW T Shirt
I have the 5.11 Tactical version, and I quite like it. Unlike the one linked to above, it is a compression fit shirt, and keeps the weapon snug against the body. It works great underneath a zip-up hoodie or jacket. Comfortable, room for spare mags or speed strips.
However, if you're wearing anything other than a zip-up hoodie or jacket over it, it's absolutely useless. Even a button-down slows down the draw too much.