I did this when I was an RA at Ohio University. Our SRA sas named Charles and we lived in the dorm called Brown. This is where the theme Charlie Brown popped up. I drew all of our staff members as Charlie Brown characters for a joke. It ended up being our welcome banner, and office tags. When Halloween came around, we wanted t-shirts. So I had this fun idea to dress our characters in Halloween costumes. The night before I did this, I asked everyone what they were going to be for Halloween. It then became an official staff T-shirt!