Have seen earlier iterations of this same shirt. It has been a staple item for sale @ the Greenleaf Art Center for years. Located on its namesake street just west of the Metra stop (1806 W Greenleaf). Click here to buy it.
A frequent poster on the now dead Everyblock used a childhood picture wearing a similar shirt. Not everyone living here can claim that they were "made In Rogers Park". Not even the namesake of Rogers Park, Philip Mcgregor Rogers, could do that.
So this writer thinks its okay for recent transplants like PMR himself to buy a t-shirt to support a great cause like art. Here is the Facebook for the Greenleaf Art Center. There is a members critique session coming up in September where you can get feedback on your completed or unfinished artwork.