Simply Scrumptious Hat Pattern
Gauge: 2.1 sts / inch
Pattern Repeat: (multiple of 2 sts) + 1;
Finished Dimensions: 18 inches circumference; height 10 inches with band rolled up
US Terminology used
bl- back loop
ch – chain
FPsc – Front Post single crochet
Puff St – puff stitch (see special stitches)
R – row/round
rem – remaining
rep – repeat
sc – single crochet
sk – skip
st/sts – stitch/stitches
* – Repeat the instructions between the asterisks the number of times indicated. This repeat will contain of multiple instructions.
() – Repeat the instructions between the parentheses the number of times indicated.
 – at the end of the row – the total number of stitches
Puff St – half double crochet puff stitch – basically this is a hdc3tog all in the same stitch – Yarn over the hook, insert your hook into the specified stitch, yarn over and pull up 1 loop (3 loops on the hook). Yarn over the hook, insert your hook into the same stitch, yarn over and pull up 1 loop (5 loops on the hook). Yarn over the hook, insert your hook into the same stitch, yarn over and pull up 1 loop (7 loops on the hook). Yarn over the hook and pull through all 7 loops. Stitch complete.
I used the hdc3tog in the Pretty Pebbles Stitch Tutorial. In this tutorial it was called a Cluster Stitch (often Puff and Cluster are used interchangeably). You can see how the stitch is done by looking at the tutorial photos included in the Pretty Pebbles Stitch Tutorial. View images 3 to 19. Do not follow the exact instructions as the Pretty Pebbles Stitch project does not follow the same full pattern as this scarf.
Simply Scrumptious Slouch Hat
R1: Leave a 8 inch tail of yarn; ch 10, 1 sc in the 2nd ch from the hook and each rem ch across, ch 1, turn 
R2: 1 sc in the bl of each st across, ch 1, turn 
R3-R36: rep R2 
at this point the band should measure 18 inches long by 3 inches wide
You will be working along the ends of the 36 rows of the band.
Step 1: Work 39 sc evenly across the edge of the band. Bring the two ends of the band together and continue working around the band in continuous rounds. You do not need to slip stitch to join.
Note: You can either whip stitch the edges of the band together now or wait until you are finished the hat.
Body of Hat
R1: 1 sc in each st around 
R2: 1 sc in the first st. *1 Puff St (see special stitches above) in the next st, 1 sc in the next st**. Rep around. 
R3: *1 Puff St in the next st, 1 sc in the next st**. Rep around to the last st. Work 1 Puff St in the last st. 
Rep R2 and R3; 7 more times
R18: Rep R2 
R19: 1 Puff St in each sc around. Sk all Puff St from R18. You will have 20 Puff Sts at the end of this round. 
R20: 1 FPsc around each Puff St. 
Close the top of the hat like this:
Finishing(and scroll to the bottom of the post to the diagram and Finishing Instructions)
Finished Hat: 10 inches in height with the band rolled up; or 12.5 inches in height with it unrolled.