This pattern requires 4 sts plus 3 extra. You will need to create a twisted 3 by 1 rib. cast on 15 sts. In the image above I completed the smocking for 20 rows.
Row 1 (RS) K1, (K1 tbl, P3) to the last 2 sts, K1 tbl, K1
Row 2 (WS) K1, (P1 tbl, K3) to the last 2 sts, P1 tbl, P1
Repeat these two rows until it reaches your desired length. After you have completed the rib you will create the smocking by wrapping yarn around the knit rows, pulling them together. Use the image above as a reference.