QUOTE (Jahandar @ Oct 16 2007, 11:22 PM)

OMG, where did Peter acquire the Hair Trading ability? Sylar's going to be SO jealous!

But really in Season 1 Nathan was mister clean cut, mister by the book and as such he had a nice clean short hair cut. Where as his brother was a younger more naive scruffier type, Claude even commented on Peter's hair being in his eyes as he talked about how he was so "young".
But now Nathan has been a big drunk until his Mother's attack, he let himself go to the point he became Mr. Beardy lol. So now while he shaved his beard he has kept his longer hair doo. As for Peter, he has amnesia and lost his hair somehow.