The piece is worked flat, then you sew the cast on and bind off edges together and sew another little seam to make arm holes (if you want to wear it as a shrug; it would be lovely just as a giant cowl).
The project is available as a free download from Ravelry; it’s also part of West’s pattern ebook, WestKnits Book 4: Made for Movement. The 10 pattern collection is full of hats and shawls, and you can buy the whole thing for $20 (or download and printed versions for $22).
Incidentally, West is in the running for the About.com Knitting Readers’ Choice Award for favorite knitwear designer. If you like his stuff, go give him a vote. There are also categories for favorite knitting blog, favorite knitting book of 2012, favorite yarn company and favorite needle brand. You can get all the details here.
[Photo via Ravelry.]