Cast on 50 stitches (or 16 inches).
Row 1: Slip 1 stitch purlwise with yarn in front, * yarn over, purl 2 together, and repeat * until the end of the row and knit last stitch.
Repeat step 2 until scarf reaches 72 inches.
Bind off loosely, using a larger needle if necessary to retain stretch in the fabric. (Steam lightly, if needed.)