I'm done with the body and sleeves of the airy wrap-around sweater. I chose to knit the sleeves up straight, because I think I'll be able to minimize armpit holeage with the seam. The yarn is an alpaca silk which is the same weight as the suggested yarn, but I think it probably has more drape and definitely has more stitch definition. I had to go up to 13s to get the gauge, which is not unusual for me.
BoltofTrash: Sorry, I returned my book to the library and only have copies of a few patterns, so I'm not even going to hazard an answer to your question.