I have several square bottom shirts made by Dickies and they come in different colors and patterns. I got mine from Bells. In the summer I wear black T Shirts with different Texas Longhorns logo on them...that way people just think I am a football nut instead of a gun nut. I will, also, encourage you to get a good gun-belt, you will never regret it. I cannot over emphasize the difference it will make. I like the Beltman he makes an excellent belt.
-geo