I've made that hat a couple of times, and found that the seam was not really a big one, so it wasn't a huge problem. I don't know how you'd go about knitting it in the round, though.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry