Shown with a cast-on count of 33 stitches.  

• Row 1 (RS): Sl1 wyib, k1, yo, k2tog, yo, k2tog, k5, k2tog, yo, k1, yo, k2tog, k5, k2tog, yo, k1, yo, k2tog, yo, k2tog, yo, k5 (34 sts).
• Row 2: K5, (k1, p1) in next st, purl to last 2 sts, k2 (35 sts).
• Row 3: Sl1 wyib, k1, yo, k3tog, yo, k2tog, k3, k2tog, yo, k3, yo, k2tog, k3, k2tog, yo, k3, yo, k2tog, yo, k2tog, yo, k6.
• Rows 4 and 12: K6, (k1, p1) in next st, purl to last 2 sts, k2 (36 sts).
• Row 5: Sl1 wyib, k1, yo, k3tog, yo, k2tog, k1, k2tog, yo, k5, yo, k2tog, k1, k2tog, yo, k5, yo, k2tog, yo, k2tog, yo, k7.
• Row 6: K7, (k1, p1) in next st, purl to last 2 sts, k2 (37 sts).
• Row 7: Sl1 wyib, k1, yo, k3tog, yo, k3tog, yo, k7, yo, k3tog, yo, k7, yo, k2tog, yo, k2tog, yo, k8.
• Row 8: BO 6 sts, k1, (k1, p1) in next st, purl to last 2 sts, k2 (32 sts).
• Row 9: Sl1 wyib, k1, yo, k2tog, yo, k1, yo, k2tog, k5, k2tog, yo, k1, yo, k2tog, k5, k2tog, yo, k2tog, yo, k2tog, yo, k4 (33 sts).
• Row 10: K4, (k1, p1) in next st, purl to last 2 sts, k2 (34 sts).
• Row 11: Sl1 wyib, k1, yo, k2tog, yo, k3, yo, k2tog, k3, k2tog, yo, k3, yo, k2tog, k3, k2tog, yo, k2tog, yo, k2tog, yo, k6 (35 sts).
• Row 13: Sl1 wyib, k1, yo, k2tog, yo, k5, yo, k2tog, k1, k2tog, yo, k5, yo, k2tog, k1, k2tog, yo, k2tog, yo, k2tog, yo, k8 (37 sts).
• Row 14: K8, (k1, p1) in next st, purl to last 2 sts, k2 (38 sts).
• Row 15: Sl1 wyib, k1, yo, k2tog, yo, k7, yo, k3tog, yo, k7, yo, k3tog, yo, k2tog, yo, k2tog, yo, k10 (39 sts).
• Row 16: BO 7 sts, (k1, p1) in next st, purl to last 2 sts, k2 (33 sts).