We paired a bulky cream-colored wool with a fine light-blue mohair and used a U.S. size 20 needle, so we only cast on 14 stitches. To Knit Scarf: Cast on, working with both yarns together. Work in 1 x 1 rib (knit 1, purl 1; repeat across row) for the length of the scarf. Bind off. Weave in ends.