Round 1Start with a slip knot, chain 4, join with a slip stitch to form a ring. Chain 2 (does not count as a stitch), make 10 double crochets (DC) into the ring. Join with a slip stitch to the first DC.
Round 2Chain 2 (not a stitch), make 2 DC in each stitch around. Skip the initial 2 chains and join with a slip stitch to the first DC. You’ll have 20 DC.
Round 3Chain 2, make 2 DC into the first stitch, then 1 DC in the next stitch. Repeat the sequence around, ending with 30 DC in total. Join with a slip stitch.
Round 4Chain 2, 2 DC in the first stitch, then 1 DC in each of the next two stitches. Repeat around to have 40 DC. Join with a slip stitch.
Round 5Chain 2, 2 DC in the first stitch, then 1 DC in each of the next three stitches. Repeat around, ending with 50 DC. Join with a slip stitch.
Round 6Chain 2, 2 DC in the first stitch, then 1 DC in each of the next four stitches. Repeat around for a total of 60 DC. Join with a slip stitch.
Round 7Chain 2,2 DC in the first stitch, then 1 DC in each of the next five stitches. Repeat around for 70 DC in total. Check the diameter – it should be approximately 6.5 inches or 17 cm for an adult size. Join with a slip stitch.
Rounds 8–9Chain 2, 1 DC in each stitch around, no increases. Join with a slip stitch at the end of each round.
Round 10Turn work, chain 1, 1 single crochet (SC) into each stitch around. Join with a slip stitch.
Round 11Arrow Stitch Pattern Chain 2, turn work. Start making arrow stitches: Skip the slip stitch, work a starter of a DC, but don't complete.Yarn over twice, make a front post triple crochet around the third DC from two rounds below, but don't complete. Yarn over, pull through all loops on the hook. Make 3 DC behind this stitch, then a front post triple crochet, yarn over, and pull through all loops on the hook to complete the Arrow Stitch. Continue the sequence of 5 stitches to form the Arrow Stitch pattern around. Join with a slip stitch.
Round 12Turn work, chain 1, 1 SC into each stitch around. Join with a slip stitch.Repeat Rounds 11 and 12: Continue the pattern for the desired height of the hat.