21st Birthday Shirts are the perfect way to remember your night! Even if you don’t remember it, the physical evidence will be with you forever. They also make awesome gifts! Shirts come in almost every size and each one comes with a permanent marker. The lines across the back make it easy to keep track of what you had to drink, and which one of your friends ponied up the dough for it! Who knows, you might even end with some hottie's number on there (not that you'll remember what they look like)!