Case in point: the Tala Hat by Martin Storey from Easy Winter Knits.
That, my friends, is a seriously bulky hat. It's knit from Rowan's new yarn called Tumble which is a super bulky super fuzzy 90% alpaca 10% cotton blend. 77 yards to 100 grams. This hat took about a skein and a half.
Ignore my Margaret Hamilton nose
I knit this as a sample for For Yarn's Sake so that people could see how the yarn knits up. The pictures above show the pattern as intended. I did modify the patter to be knit in the round though. Rowan writes EVERYTHING to be knit flat. I don't mind knitting flat and seaming if there is a reason to do so, but there is no possible reason why this hat should be knit flat. None. I subtracted two stitches and altered the wrong-side row instructions to reflect that I was knitting circularly.
As written, there is no pompom, but the hat was sticking up a bit stiffly giving a serious conehead-type look. I added the pompom to put some weight on the top of the hat and pull it down for more of a slouchy look.
I think this is definitely the type of style that only a certain sub-set of the population can pull off, but I love it. If I were still in Wisconsin I would not think twice about making a hat like this for myself. For the Portland winter, it might be a bit overkill.