This versatile line and filling stitch can produce different effects according to the length and positions you choose for the base row of stitches.
Step 1. Work a row of vertical straight stitches. Fasten off. Bring a new thread up at A and slide under first stitch. Go down at B; come up at C. Repeat along row.
Step 2. As a filling stitch; come up at K; slide thread through base of H and I; go down at I, up at M; repeat. Pierce fabric only at base of row being worked.