Come on guys, lets keep it nice and supportive shall we? Imagine YOU were the one to post a question and got these sorts of replies. Not very nice.

IT-No, i have never asked my T, but it's not something that bothers me (her hairstyle i mean). I think it's great that you have a good enough relationship with your T to be able to ask.
Do you know what it is about brushing/combing her hair that appeals to you? Have you discussed this with your T (at length, not just asked the question) and worked through why you desire to do this?