Depends on what the number of preorders vs. stock. If the store has plenty of t-shirts then it should be one per preorder, but if supples are short it will be one per customer.
If you’re buying all the versions of the game and expect to have a bunch of t-shirts don’t expect the employees to go with it.
Exactly how I feel. I mean, I think I have 7 Ghostbusters shirts already now, so I’d have much rather had something else, but it is cool to at least get anything.