if male and female fashion were the same, and had all the same variations, it wouldn't be possible to dress wrong.
we all usually dress sinfully anyway:
"Thou shalt not wear a garment of divers sorts, as of woollen and linen together." (Dueteronomy 22:5 KJV)
nowadays we even mix different materials in the same textile, that can't be good for us.
i really wish the bible revealed more of the context in which the different texts were written. why did someone have to forbid men from wearing women's garment and women from that which pertains to a man? something must have happened to earn it a line right there, but only those who lived at the time will know what.