I knitted this sweater with 9 skiens of Andean Treasure Yarn 100% baby alpaca wool from Knitpicks. It looks like the red iron oxide color I chose is no longer listed. It was wonderful to knit with. The yarn would slip over my fingers like melted butter.
The pattern was from Vogue knitting holiday 2010. The pattern called for Berroco's Flecked "Blackstone Tweed" but I decided to use the alpaca instead. I think my choice was ultimately better because its actually a nicer material at $4.99 a skien. The Berroco was a mixture of wool/superkid mohair/angora rabbit hair at $8.99 a skien. The thickness seems okay despite the substitution, and I actually didn't have to change my gauge from the one listed in the pattern. It was almost too good to be true. The only misgiving is that I don't have the cool freckled effect that the pattern shows. I'll have to handwash both anyway.
With most of the pattern being stockenette, I was able to finish this sweater casually in 2 weeks.
Update: as with all good things, this sweater met its end. I accidentally put it in the wash and it was felted.