Thanks for the suggestions; they will definitely help.
I did look on eBay for the Jaeger cashmere, but couldn't find any. Of course, they could call it by some catchy yarn name that I don't know about, but the book just calls it "Jaeger cashmere."
I want to do make this pattern because it's all in one piece and I won't have to seam sleeves into armholes. I am not ready to tackle that. I also want to get a kit (when I can get to a yarn store) for the famous tulip baby sweater because someone I met at a yarn store a couple of weeks ago was knitting it and she said that the sleeves are knit from stitches that have been placed on holders, not as separate pieces.
I have a large skein of a Bernat baby yarn (forget what they call it) that's dk weight (got it from Wal-mart--that's my "local yarn store!"); I might try this pattern with that just to see how well I can knit it.
Thanks again for your suggestions; I'm going to copy the suggested substitutions into a file and save it to look for some of those yarns to use.