OK, I am actually in possession of an official Pirate Party Australia t-shirt, but I’m trying to make a point here about the nature of modern culture. The design is released under the Creative Commons Attribution 3.0 Unported license. The SVG source is available on GitHub.
This is not official Pirate Party Australia merchandise. Nevertheless, all proceeds from the sale of this item will be donated to Pirate Party Australia – and you have my solemn word on that as a Pirate.