Welche Vorstellungen haben Sie bezüglich Stil und Thema vom t-shirt?
Keep the message clear and easy to read. Most people walking by will have 3 seconds or less to read it. Think of something that can capture the attention of someone walking by. Most people in malls are looking all over the place.
Things that you might want to use to catch the attention: (you don't have to use all of them)
* No more printed coupons
* No more prepaid deals
* Sign up is completely free
* Mention an incentive of free dinner if they signup now.