Co 252. Join, and place marker.
Row 1,2,4: *p4, k3*, repeat from * to * to end.
Row 3: *p4, sl 1 knit wise, kfb, k1, slip slipped st over kfb stitch and knit stitch*, repeat from * to *'to end.
Repeat rows 1-4 until desired width is achieved.
Co loosely, following the rib pattern.