Welcome to Puppets and Stuff. So glad you decided to join and ask questions.

Nice puppet BTW.
In one of the topics that Gabriel linked to you'll see this image posted.

This is a really good image to see that really the body is a tube that has simply been tweaked. Now have a look at what Arthur just posted. Envision that over you pattern you use now. Can you see how the darts and angles change the shape? Also to see the full pattern you need to use the "Download document in original format" below the preview of the file. It is in pdf form.
Also it looks like you have a pretty sweet shirt for your puppet. If you where to take the pattern you used for that and removed the arms and perhaps decrease the size just a bit you would have a pretty good body pattern I would think. I might be wrong on that one but looking at the picture that is the impression I get.
I think all this should get you started but feel free to ask more.