I generally concur with all the advice given so far. I have met a couple brothers in Biglaw who have locks that were well kept, so I know it can play over in the professional setting. I remember one cat in particular was at Paul Weiss here in NY. Understand that not every firm may be as progressive as others though, so you have to take that into consideration.
In law school it doesn't matter at all. When applying for jobs it may matter, depending on the cultural awareness of the firm.