With crochet hook and smooth contrast yarn, chain 125 sts. (I usually chain many more than I need for more ease in starting.) Using the appropriate needle for your project, pick up 125 sts in the back “hump” of each chain. (The back hump is found behind what looks like a “v” on the crochet chain. Be careful just to pick up in the hump and try not to split the yarn.)
Row 1: Knit
Row 2: K1, inc in every st by knitting into the front and back of each st, end with K1.
Row 3: Knit /(K 3 rows)
Row 4: K1,*YO, K1. Rep from * across row.
Row 5: Knit/(K 3 rows)
Row 6: K1,*YO, K2. Rep across row, end with a K1.
Row 7: Knit/(K 4 rows)
Row 8: K2,*YO, K3 across row, end with a K2.
Row 9: Knit/(K 2 rows)
Row 10: K1,*YO, K2 across row, end K1 /(Bind off scarf with doubled strand of contrast yarn.)
Row 11: (Boa only) Knit
Row 12: Bind off boa in contrast yarn