^That's very true, I know a girl who's in the army and when on duty she always wears her hair in a bun. Then again buns are fairly common around here.
However Starfleet doesn't really seem to have any sort of regulation when it comes to hair other that it has to be tidy. Throughout the shows we have seen women with buns, beehives, ponytails, perms and freely flowing hair and likewise we have seen men with ponytails and mullets. It might be regulated according to your position? A security officer might have to wear their hair short or in a bun while a astronomic researcher can wear theirs dangling freely around their shoulders.
However Starfleet doesn't really seem to have any sort of regulation when it comes to hair other that it has to be tidy. Throughout the shows we have seen women with buns, beehives, ponytails, perms and freely flowing hair and likewise we have seen men with ponytails and mullets. It might be regulated according to your position? A security officer might have to wear their hair short or in a bun while a astronomic researcher can wear theirs dangling freely around their shoulders.