Hmm, it seems, if you weren't logged on when you made a purchase, you need to provide the Order Number for the tshirt you are submitting a photo for :-/
That's new and odd. I understand threadless has to deal a lot with people taking multiple pictures for the same shirt, but we were never told or warned this would happen, so there's no way I can recall any of the order numbers.
In my last blog I posted pictures of a shirt I wanted to submit, but the shirt was given to me for birthday back in January (I hadn't had a good place to take pictures with it until now), so there's not much I can do.
Sorry for the complaining but ehh.