I am all for concealed carry and open carry. In my opinion though, if you are concealing it is because you want to retain the element of surprise, and don’t feel the need to advertise to the entire world that you have a handgun on you. That, or else State law only permits you to carry concealed.
The shirt might as well read: “HEY EVERYBODY LOOK AT ME… I am an attention whore!!!”
I imagine there isn’t a law on the books about advertising the fact you are conceal carrying… but if you go around telling everyone you have a gun, I bet your permit wouldn’t last very long.
If you disagree with me, then by all means blow $27.80 to prove to the world that you are a tool :D