Leaving a long beginning tail, chain 39, single crochet in 2nd chain from hook and in each chain across; join with slip stitch in first single crochet - 38 single crochet at the end of this round. Use yarn tail to sew gap at beginning closed.
Round 2: Chain 2, half double crochet in each stitch around; join with slip stitch in top of beginning chain - 38 half double crochet at the end of this round.
Repeat Round 2 until piece measures about 10 1/2 in. (26.5 cm) from beginning.
Fasten off, leaving a long yarn tail. Using large-eyed needle, thread yarn tail through stitches of last round and pull to gather. Knot securely.
Weave in ends.