I doubled the yarn and followed this construction:
CO 89 sts
1 1/2” of 2x2 ribbing
shell lace pattern for 3 repeats
1 1/2” of 2x2 ribbing

Shell Lace (multiple of 11 sts + 1)
Row 1 (WS) and all WS Rows: Purl.
Row 2: K2 tog, <>k5, yo, k1, yo, k2, sl1-k2tog-psso; rep from <>, end last repeat as ssk.
Row 4: K2 tog, <>k4, yo, k3, yo, k1, sl1-k2tog-psso; rep from <>, end last repeat as ssk.
Row 6: K2 tog, <>k3,yo, k5, yo, sl1-k2tog-psso; rep from <>, end last repeat as ssk.
Row 8: K2 tog, <>k2, yo, k1, yo,k5, sl1-k2tog-psso; rep from <>, end last repeat as ssk.
Row 10: K2 tog, <>k1, yo, k3, yo, k4, sl1-k2tog-psso; rep from <>, end last repeat as ssk.
Row 12: K2 tog, <> yo, k5, yo, k3, sl1-k2tog-psso; rep from <>, end last repeat as ssk.
Rep Rows 1-12 for Shell Lace repeat.