For future reference - don't ever feel guilty if someone tries to play the "I HAVE to have it in time for this convention and I won't have the money until after!" card. It is clearly in your TOS, and even if it wasn't, it's outrageous to expect someone to ship something before it's been completely paid for. No online retailer ships anything until they have been paid, and you should be no exception.
You would not be a bad seller for putting your foot down and saying, "I'm sorry, but I cannot ship the suit out until it has been paid in full." It will not damage your reputation, because if he were to publicly complain that you refused to ship before his deadline (when he didn't pay in full), no one with half a brain would take his side. If he gets mad at you for refusing to ship before cash is in hand, then he's the unreasonable one, not you.
That said, there's not much that can be done now :( If he has the suit, there's not much you can do to get your money back, aside from hoping he does the right thing and pays. If it becomes obvious he's not going to pay the balance, I'd recommend making another Beware entry warning others about him by name, because that would be outright stealing.
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You would not be a bad seller for putting your foot down and saying, "I'm sorry, but I cannot ship the suit out until it has been paid in full." It will not damage your reputation, because if he were to publicly complain that you refused to ship before his deadline (when he didn't pay in full), no one with half a brain would take his side. If he gets mad at you for refusing to ship before cash is in hand, then he's the unreasonable one, not you.
That said, there's not much that can be done now :( If he has the suit, there's not much you can do to get your money back, aside from hoping he does the right thing and pays. If it becomes obvious he's not going to pay the balance, I'd recommend making another Beware entry warning others about him by name, because that would be outright stealing.