Shown with a cast-on count of 26 stitches.  

• Row 1 (RS): K3, k2tog, *yo, k1, yo, ssk, k5, k2tog, repeat from * to last st, yo, k1.
• Rows 2, 4, 6, 8, 10, 12, 14, and 16: Purl.
• Row 3: K2, k2tog, *[k1, yo] twice, k1, ssk, k3, k2tog, repeat from * to last 2 sts, k1, yo, k1.
• Row 5: K1, k2tog, *k2, yo, k1, yo, k2, ssk, k1, k2tog, repeat from * to last 3 sts, k2, yo, k1.
• Row 7: K2, *k7, 3-to-3 gather, repeat from * to last 4 sts, k4.
• Row 9: K1, yo, *ssk, k5, k2tog, yo, k1, yo, repeat from * to last 5 sts, ssk, k3.
• Row 11: K1, yo, k1, *ssk, k3, k2tog, [k1, yo] twice, k1, repeat from * to last 4 sts, ssk, k2.
• Row 13: K1, yo, k2, *ssk, k1, k2tog, k2, yo, k1, yo, k2, repeat from * to last 3 sts, ssk, k1.
• Row 15: K4, *3-to-3 gather, k7, repeat from * to last 2 sts, k2.