I am not sure when the R themed clothing started, but we did a couple of T-shirts back at Revolution Computing. They mostly featured fractals and the R logo, but they were black and therefore cool.
The first really great R shirt I ever saw was from Drew Conway and the NYC Data Mafia. I think it still may be the best out there.
REvolution Analytics recently came up with the I Love R T-shirt (I can not find an Image). I first saw them at the R/Finance meeting in Chicago. Their 70s retro look seemed to be very popular. In fact, a recent twitter contest attracted over a thousand crazed statisticians in pursuit of five T-shirts.
Always trying to copy a good idea I came up with a design of my own and a twitter contest as well. Sadly, while Revolution added followers my social media effort actually resulted in a reduction in followers. See my failed design below.
Never one to give up after crashing into the ground in a ball of flames, I have decided to enter the fray once again with me new R package and T-shirt design. I call it R-apture. R-apture is a twitter data mining package that scans for posts that would eliminate the sender from being called to Heaven and then sends a comment back to that tweeter that they are screwed. The T-shirt design is simple with the words " I am getting R-aptured on