I have a couple of balls of Estelle Drake yarn that is pretty similar and thought I'd knit a couple of hats. The patterns are pretty easy but I really couldn't make the patterns work for me with the given needle sizes or number of cast on stitches. Perhaps the Olympia yarn is a lot thicker than the Drake... I don't really know.
So I went on Ravelry to search for a "free bulky hat" and found a few possibles then realized Brioche pattern would achieve the results I wanted - some stitch definition, squishy, thick fabric, etc. I used this one as my guide.
I first tried the Provisional Tubular Cast on where I used waste yarn, knit for 4 rows then on the 5th row folded the fabric wrong sides together, knit the knits and picked up and purled the stitches from between the waste yarn stitches. It was really tedious and not stretchy enough.
-tail cast on with knit- and purl-type stitches. It worked MUCH better and is much more elastic. The only tricky part is learning the actual alternating knit and purl cast on, The subsequent set up rows are very easy to execute.
After the set-up rows, I did three more rows of 1 x 1 ribbing, then began the brioche stitch outlined in the pattern. It is one where you use yarnovers. I found it to be pretty confusing for TV watching so investigated and found another method:
Round 1: *knit into the stitch below (from front to back), purl the next stitch, repeat from *.
Round 2: *K1, purl into the stitch below the next stitch (from back through to the front), repeat from *.
That was WAY easier.
Once I got that established the rest was pretty easy. It is also easy to figure out which row you are on if you lose track or get distracted by investigating the stitches where you can clearly see that you have either purled through two stitches or knit through two stitches in the previous row.