I too think that the clothing thing is way out of line. History is replete with men and women wearing all sorts of clothes. We regularly have one of our observing friends wear a kilt in the summer. No one says anything about it. Men and women have historically worn heels, tights, makeup, long hair, and jewelry.
I remember hearing the following joke in the seventies:
What's the latest thing in men's clothing? Women.
Today's fashions, are for the most part, not very gender specific. I know that if a well dressed woman were to show up in the protestant america of the 17th century, she'd likely be tied to a stake for improper display of her womanly charms.
So, clothing is really not an issue. It is the image it portrays. If it is dressed as a woman, it must be a woman. If it is not, we are messing round with a very strong societal need to distinguish between the two sexes. Yes, we are totally caught up in procreation. And any fiddling with the markers that split the two sexes so that we can continue to procreate, can totally screw up most primitive thinkers.
That's why it is so important... so that guys can keep their daydreams and libidos strong for the "right" reasons.