This Leia hat is so awesome, I'm not only going to link to the post (with pattern!), I had to show you the picture as well. Simply awesome and fun. Something about it didn't seem quite right, though, so I did some Google image searching.
It should be browner with a part in the middle. So my suggestion would be to still knit it in the round, but put a purl (or two) into the front middle and back middle, running the whole way up.
The only problem left is that you won't be able to hear all the compliments on how frigging awesome your hat is.