From the pattern write-up:
“For a cover-up a little out of the ordinary, knit this comfy cape in stockinette stitch…The project works up quickly in two sections (front panel and front sides/back) to the top of the armholes openings, where the sections are joined and knit in the round for the remainder of the garment. The cape has a turtleneck with rolled edge…”

See pages 74-75 (pictures) and 106-107 (instructions)

The yarn is listed as “White Buffalo 6-Ply”, but this editor believes that it is the same as the Ravelry listed “White Buffalo Unspun”.