If I make the USMP again I will use an alpaca. I have a sweater almost finished out of Inca Alpaca and that knit fabric is what I would have liked for this design.
So, bad choice of yarn on my part - live and learn.
I unravelled it so that the yarn, which is too nice to sit in a pullover unloved, can become this
or this - which are written for Rowan cashsoft 4 ply which is essentially the same yarn.