Well the way I read it, its to stop people from passing themselves off as opposite sex, if you think people wanting sex changes is a modern thing, then think again, its not. Trousers or pants as you Americans call them, in UK we use the word pants for underwear, were not really worn in those days or culture anyway, Trousers are accepted as unisex today, certainly for a few quite a few centuries in Europe and Americas, it was the culture that men wore trousers and women wore skirts and dresses, therefore to make such an issue out of women wearing trousers based on Levitical law is ludicrous