I made a hat to go with the BSJ (which now has all 5 buttons sewn on!). I used the Tychus pattern, but made a few mods. I only used the one yarn that I used for the jacket. I only cast on 26 stitches and then did the short rows down to 20. it made the crown smaller, but it also made the "wedges" smaller, so I ended up with 12 wedges. I also added a crochet trim to match the jacket. The only thing I don't like is the seam. I much prefer hats worked in the round, but I liked the look of this hat with the BSJ.
Now, I'm working on the booties!