T-shirts are still a good idea, but the design may be on hold due to a few upcoming changes here.

And even if we had an Ozformers T-shirt, you'd still need something with a name on it, like the lanyard/nametag ideas.

Besides, I'm wondering if many people would want to show up to the one event in the same clothing? Even at dedicated TFs events like BotCon, you don't get many wanting to be seen wearing the same thing (even the botcon tshirts).
When we've had 2 people wearing the same TFs T-shirt at AUS meets, one or both have felt weird, but I suppose the option will be there for people to decide for themselves on the day.