Email the Bungie store. The forums are for the game itself, not merchandise so you're not going to find any help here about your shirt.
It took 3-4 weeks for mine to come in. Your's might take longer since you ordered near the deadline.
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Well, I wanted to complain here before I actually complain on the email. I'll give it another week before I actually email, but the waiting time just seems like they've forgot it...