Following is my version of this hat:
This is a very simple style to make: You crochet a chain that's about 12 inches* long, and work single crochet through the back loops only. Once you reach the desired width of your hat**, you seam the back (I crocheted mine together, reversing the stitching for the cuff turnback.) And then you gather the top of the tube. I sewed through one strand of the front-loop ridge stitches for a less bulky finish.
* A 12-inch deep hat will give you a nice, big cuff. Mine is actually about 11 inches deep -- I think my stitches got a bit tighter as I worked. To make a bigger, fatter cuff that you can turn back twice (like the hats in the background of the "Modular Crochet" book cover in the preceding post), start with a chain about 15 inches long.
** Try on the hat as you go, by folding up a cuff and checking to see if the width will fit around your head. This back-loop-only-rib stitch is VERY stretchy. My hat is about 20 inches around, and it's a very comfy fit.