Once the Kickstarter has ended, we'll send out a survey asking for everyone's address and for their choice(s) of panties, shirts and other rewards! Once we have that info, we'll get your order together and ship it off!!!
You can get whatever size and design combo you want! We'll honor anything you order! You want to order 5 pairs of Shark Week in 5 different sizes? Great! No problem!
We originally thought keeping big orders to all one size would make things easier, but then we realized it doesn't matter in the least. Unfortunately kickstarter won't let us change pledge level descriptions once they've been posted, so we're stuck with the "all one size"caveat. Just consider it an artifact.
Don't see the answer to your question? Ask the project creator directly.