Smoothing a “Stair Step” Bind off:
When binding off for the shoulder of a sweater, the bind offs most often take place over a number of rows. This can leave the final edge looking like steps in a staircase. To work a more evenly shaped edge, slipping some of the edge stitches while binding off (as described below) works wonders.
Work the first BO row as you normally would. *On the following row, slip the last st purlwise. Turn and slip the first 2 sts, one at a time, purlwise. Then slip the first slipped stitch over the second. BO the rest of the necessary sts, counting the slipped st as 1 bound off stitch; repeat from * the number of times required for pattern.