With two yarns together, cast on a multiple of 4 sts + 2 + 2 edge sts to the desired width.
Row 1 (on right side): K1 (edge st), * K2, P2 *, repeat from * to * ending with K2 and K1 (edge st).
Rows 2 and 4: Work sts as they appear.
Row 3: K1 (edge st), * P2, K2 *, repeat from * to * ending with P2 and K1 (edge st).
Repeat rows 1 to 4 until desired length.