Au contraire, ma soeur! Christianity SHOULDN'T work that way, but thanks to Puritans and holier-than-thou types, love of legalism gives way to stretching Biblical precepts and morality into a much wider umbrella than it should be in every case.
I should add that most conservatives and fundamentalists consider it a sin to cross dress because God wants the distinction between the genders to be polarized. And that goes for women wearing pants most of the time. And men having long hair. Apparently any other adoption of physical characteristics "belonging" to the opposite gender is not only confusing and degrading to one's gender, but disdainful of God's plan and design for humans.
Which is why He wisely made it biologically impossible for men to grow LONG hair.