I still want the shirt in question, Bethesda still doesn't have anyway for me to get one.

That guy did get all that stuff after making a really good rap about Dishonored... Keep your eyes out for the next game they publish and make the best video you can of it. Or just go on eBay. Whichever sounds less likely to end up not working out so well.
I was amazed that guy didn't get some super special awesome edition of the Skyrim Collector's Edition dragon statue. It just amazes me because they may have had some extras around that were surplus for all we know. I'm glad he got a Pipboy and hope all owners of those use them for good and not evil.
I'd love to have the Dishonored shirts, myself. And the hat. That hat is exactly what I mentioned I would love to see once. It looks like a hood. I guess I'll just use the hood from my old King Mickey Halloween costume if I wish to have a TES hood.