Well kristen stewart wore one in eclipse and it didn't do anyharm. Does anyoneelse think 12 will be dissapointd to miss out on being ginger again ?. Sure he will get use to his new more mature look.
I think he just liked the shaven look. He'd always avoided such short hair previously because of a scar. Though you're right about shorter hair being easier to put a wig over. That was Karen's problem. Her hair wasn't really much shorter, the problem was that she'd had a fringe cut. Wouldn't have been an issue if Guardians of the Galaxy had been shooting already, lol (she got a zero buzz for it, remember).
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I suppose that Moffat's fertilizer didn't work, because it wasn't anywhere near long enough for him not to require a wig even before this.
http://www.youtube.com/watch?v=PtLe_KHCTfQ
(Actually, I assume the reason he shaved his head again is because it will allow for a better fitting wig.)