I'm not 100% sure on this. I know they ask for your shirt size, but they also say they can't guarantee the size will be available. I assume the reason they ask is so they have a good idea of how many shirts to stock for the different events... Such as, "I beat Ramuh!" or "I beat Shiva!" I don't know if we'll actually get a shirt JUST for attending. The VIPs will get a special one, though.