Pattern from Stitchcraft, August 1965. The pattern requires Patons Cameo Crepe. I found bucketloads of Patons Bluebell Crepe at a charity shop, and guessed that it was similar. Vintage yarn calls for a vintage pattern.
(But not tiny zips at the back of the neck, so I cast off before the neck shaping.)
Crepe yarn is wonderful to work with, and wears really well - this has been worn a lot, and hasn't pilled at all. It's a complete mystery to me that crepe isn't readily available any more.