Photos here: Angelgirl's New Hat (previous post)

Hook size G
Yarn: 2 ply, about 4 ounces
Size - Angelgirl is going to be 12 next month, she is petite, wears size 8 to 10 clothes

Pattern can easily be adapted for smaller or larger size.
When I first made it, it was about 2 sizes to small (only had 6 rows of dc and then started the shell rows).
Circumference - lessen or increase the number of double crochet rows (1-9), if increasing do two dc every 12 or so stictches evenly all around increasing in a multiple of 3 to keep circle flat.
Length - reduce or increase the number Shell\SC & Chain rows

Chain 4, slip stitch together to form a circle.
Row 1 - Chain 3 (counts as first double crochet), dc 9 in circle (total 10)
Row 2 - Chain 3 and dc in first stitch, 2 dc each of the remaining 9 stiches (total 20)
Row 3 - Chain 3 and dc in first stitch, *dc crochet in next and two dc in next*, repeat from * for a total of 30 dc
Row 4 - Same as Row 3, for a total of 45 dc
Row 5 - Chain 3 and dc in first stitch, *dc in next 8 and two dc in 9th, repeat from * for a total of 50 dc
Row 6 - Chain 3 and doc in first stich, *dc in next 9 and two dc in 10th, repeat from * for a total 55
Row 7 - Chain 3 and doc in first stich, *dc in next 10 and two dc in 11th, repeat from * for a total of 60
Row 8 - Chain 3 and doc in first stich, *dc in next 4 and two dc in 5th, repeat from * for a total of 72
Row 9 - Chain 3 and doc in first stich, *dc in next 11 and two dc in 12th, repeat from * for a total of 78
Row 10 - SC and Chain Space Row: chain 1, single crochet in first 3 dc, chain 3 and skip 3 dc, *single crochet in next 3 dc, chain 3, repeat from * all way around, end with slip stitch to first sc
Row 11 - Shell Row: slip stitch to second (middle) sc, chain 1 and sc, *five dc in chain space (shell), sc in middle sc, repeat from * all way around, end with slip stitch to first sc
Row 12 - SC and Chain Space: slip stich to 2nd dc, sc in middle three dc, chain 3, *sc in dc 2,3,4 of next shell, chain 3, repeat from * all way around, end with a slip stitch to first sc
Repeat Row 11 and 12 four more times, or more for desired length to fit the child; end with a repeat of row 12 (SC and Chain Space row)
Last three rows:
3 sc in each of the sc and 3 sc in chain space, all way around.
Optional - For one or two more rows sc crochet in each stitch all way around. This creates a nice edge that can be worn flat or turned up. I prefer having a total of three rows of sc to finish the hat, it just gives it a more finished look to me.

Note: I've never done a pattern before so I hope these directions clear.

Lady Rose, (founder of the Diet Pulpit the blog with fattitude! cross posted on 2 Witches Blog)