Actually, ILoveBunnies, someone on the Ferret Mailing List just the other day asked for a pattern for a ferret sweater. She's got some adrenal babies who are losing their hair and wants to make something to keep them warm during the cold months until they get their hair back. If you happen to recall how you did it, or if there are some changes you'd make if you were to do it again, I'll gladly pass it along. That is, if you aren't already a member of the FML.
Well... I basically just cast on some stitches that were a little bit longer than the circumference of the ferret and knit a giant rectangle. I measured the distance between the legs, figured out my gauge, and that told me where to make the leg-holes. I made the holes by binding off (I think I did 3 stitches, it doesn't matter because it depends on the yarn anyway) than doing the one-handed cast on when I reached the part where I had binded off on the next row. Then I kept knitting until it was a good length. I did it in stockinet stitch so that the edges would curl inward.
At the end, I sewed on buttons to secure it. I also added button holes but they ended up being poinless because the buttons fit through the yarn. But, it depends on the yarn you are using and the size of the buttons. Try to stick the button through your swatch. If it goes through, you don't need to make button holes.
It was really really simple. My crappy instructions make it seem more complicated than it was (I'm not very good at knitting). Was that too confusing? I bet a picture would be much simpler and make more sense...
Hah. Excuse my crappy Paint picture. See, super easy.