After I mastered the pattern, I was able to adapt by adding another colour, or changing stitches. For instance, the pattern uses half-dc, I used dc, or puff stitch, or cabled. It's quite versatile and challenges my creativity.
The hats were made using cotton yarn called Milk Cotton from http://www.cottonhousestore.com/mcs. I used hook number 6 from Tulip and I found the the stitches were tight. I liked it this way. Than after working with a few more hats, I changed the hook to number 8. Of course the stitches were loose and I like it this way too.
I made one for my Dad who turned 75 years old. He looked so handsome wearing the blue jeans hat.
Then I continued making for my brother, my brother in-law, my cousins, my son and my children's teachers. It's fun to make and if you are learning a new stitch, make a hat or beanie or kopiah. It'll help you practice your skill. At the end of it you have a great gift to give for someone.