A few days ago, Hypergeek revealed that Dark Horse Comics were collaborating with L.A. based clothing brand, The Hundreds (http://www.thehundreds.com/), to produce some sort of Usagi Yojimbo related apparel.
Now, Dark Horse have sent Hypergeek a press release with full details of this collaboration:

Dark Horse Teams with The Hundreds to Celebrate the 25th Anniversary Of Usagi [...]