YARN:
C1: white - 430 yards fingering/sport weight
C2: green - 430 yards fingering/sport weight

Suggested Yarn:
C1: North Ave Primaries by Plied Yarns in Natural. 100% wool. 215yds/50g - 2 skeins
C2: North Ave Primaries by Plied Yarns in Red Cedar River. 100% wool. 215yds/50g - 2 skeins

I had approximately 98 yards/23g of C1 (white) left, and 86 yards/20g of C2 (green) left over.

Should you want to complete the cowl without swapping the background colors mid way, you should have enough yarn if you use 4 total skeins of Plied North Ave. If this causes you to remove a repeat of the chart, it should still be a wearable size. NOTE: this modification was not tested at the time of the pattern release, and only based on estimated yardage.