The stitch pattern on the top down pullover is called Open Twisted Rib which is a variation of one shown in The Harmony Guides 450 Knitting Stitches Volume 2, page 68.
I also found another version of this stitch pattern on KnittingFool.com. I can’t remember how I came across this web site but it looks quite useful.
Update: A few days ago, Nanette showed a pattern called Step Dance Socks that uses this stitch.
Purlwise 
Very cool stitch and very cool technique used in making this sweater. I have been trying to put my mind to learning to knit sleeves (other than dropped shoulder sleeves) from the armhole down, and your description was excellent. Thanks!
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Rob, I’m glad that my description helped you out.
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