Here is Thumper posing in his stripy red sweater. I made it out of some Trekking sock yarn. When I was working on it, I was really worried that it would be too small, but it turned out to be the only thing that fit.
It's a great sweater for taking him out, because we don't have to worry about losing his hat. The zipper is up the back, so it won't get caught on his chin. I found the pattern for free online. The picture posted with the pattern is a quite ugly pink sweater with uneven seaming, but I took a chance and it turned out great.
Enjoy the picture!