There are several options, some of which you may already have in your stash. Marly Bird's Chic Sheep yarn, Bluprint's Cloudborn Superwash Merino Worsted Twist, LB Collection Hand-dyed Superwash Merino, Patons Classic Wool Worsted and Sugar Bush Bold will all work well with this pattern. If you are a KnitCrate subscriber, several past months yarn options are medium weight wool blends.