The real life comic pin-up girl, Ruby Rocket posted this in her myspace blog:
Hey y’all! So, the shirt designs are pretty much cemented and I should be ordering them soon. If you’re interested in purchasing one, let me know ahead of time (and your size) so I can make sure to order enough! The RR logo on the front was done by the marvelous Big Chris and on the center, top of the back it will say www.rocketsagogo.com
and tell her that you want one!