This is the Pea Patch Diaper Wrap pattern, size XL. I decided to add a few space invaders, courtesy of the bmp sock pattern from knitty. The sock pattern also has a chart for the little shooter that you use in the video game to stop the alien onslaught. I thought about adding that as well, but it would have been placed right on his butt and I think it would have been, well, let's just say that he has enough shooting out of there.
The two shades of gray are made from our sheep's wool. Thankfully, these are large on Silas, so they should fit for a while to come.