Showing the label and print count of the Berlin T-Shirt series

The Berlin Shirt series contains the Shirts of Berlin logo and the print count on one of the selves. The side is chosen by coin flipping. It has taken some time to find the right size. I was thinking about other labelling options but for know this is the one as I can label the shirts on my own. What kind of label do you think would look great at the T-shirts?