Deuteronomy 22:5 The woman shall not wear that which pertaineth unto a man, neither shall a man put on a woman's garment: for all that do so are abomination unto the LORD thy God.

Pretty clear that men wearing women's clothing and women wearing men's clothing is an abomination to God. What is not clear and will involve study and prayer is what constitutes the clothing of each gender.

After studying out the issue of pants - how it was men who wore them in the Bible, the history of pants in North America - I am firmly convinced pants are a man's garment and God doesn't want women wearing them (and vice versa - He doesn't want men wearing skirts and dresses either).