It's a pillow? Even better. Thanks for the explanation, I now remember it. (My sometimers, I guess.)
If you're knitting in the round on both sweaters, use a smaller needle for the left and you can have two mismatched sets and work on 2 sweaters. If you work flat to start you'll have to borrow the same size from the other one for a while but then you can return it and the other one probably won't be any the wiser.
I got a few *ahem* balls of the Felici too for the same reason. I don't remember which colorway but my DS thinks I'm going to make him socks. I probably will but he's got big feet!