Duane, they have a pretty good silk screen t-shirt shop over at the prison, except the shirts would all say "STATE PRISONER" on the back!
You can see some of their "handy work" over at the Prison Museum & gift shop.
I have worn one of their shirts to a couple of club meetings. You know the; "Folsom Prison, the Legend Continues", shirt!
jdog
P.S. I don't think your stuck with "State Prisoner", they have "Parolee" as well!