Taken from Interweave Crochet Magazine - '11 Accessories: "Worked from the center out in mirrored halves of shell stitch crochet, this cowl snugs around your neck or slips over your head."
This pattern is in Interweave Crochet Magazine - '11 Accessories, page 95.
Size US H crochet hook (or size needed to obtain gauge) is required but not included.