If only knitting the hat, 1 skein of each color is needed. If only knitting the cowl, 2 skeins of MC and 1 skein of CC are needed. If knitting both the hat AND the cowl, 3 skeins of the MC are needed, and 2 skeins of the CC.

Emma’s Yarn Simply Spectacular DK (3.5oz/100g ea approx. 255yds/233m, 75% superwash merino, 25% nylon) in Beach Please (MC, taupe, 455 yds/416 m used for the cowl, 135 yds/123 m used for the hat, 590 total yds/539 total m used for both), and Shut The Front Door (CC, pink, 225 yds/206 m used for the cowl, 65 yds/59 m used for the hat, 290 total yds/ 265 total m used for both)

Hat and cowl are both worked from the bottom up in the round seamlessly. The corrugated ribbed edgings are done on the smaller circular needles.
Yarns should be carried up on the inside, trapped every few rounds.