So, if you go into the Ministry of Paranormal Research & Defence building and, upon entering through the front door, turn left and, just next to the potted plants, you'll see a gift shop. It has everything you'll ever need to proclaim where you stand in the war between humans and vampires.
You can get Jack's shirt from PAGAN, Marie's shirt from CRUSADER, and even a bear.
Actually, this could just be a tremendously self-indulgent act. See, I collect shot glasses and it recently occurred to me that, having bought the Hunter shot glass, I could change the design... over and over... and just keep making MPRD shot glasses for my own collection.