I should've paid in-advance for mine.
Voted "bring more" because I waited until afternoon to buy an XL only to find they were all sold.

Realize you can't hold one based on somebody saying they wanted it - don't remember if there was an option to pay in-advance for the shirts before ('course, we waited to register until we got there, too).
Hoping the L t-shirt doesn't shrink, like my last leather jacket did...
