We were planning on going to Regina, Sakatchewan, for Christmas 2012, and thus a new hat was needed for my husband. He picked the pattern and of course went for a simple one. I did have to rip out and reknit to make it big enough, but it worked out in the end. It's said to be very warm, which is needed for the -30 deg C that one can easily encounter on the prairie.
Yarn: 2.25 skeins of Berroco Blackstone Tweed Chunky in a light grayish brown
Needles: 5.5 mm for the brim, 6.5 mm for the body
Pattern: Jason's Tweed Hat by Melissa Thomson
Modifications: I added 10 stitches to make it big enough, thus 80 stitches, and I used Techknitter's flat top method for the top.
Comments: The yarn is a bit splitty, and doesn't like being ripped back much.
Ravelry link: http://www.ravelry.com/projects/laurendw/jasons-tweed-hat