Deuteronomy 22:5 "A woman shall not wear that which pertains to a man"
Can you imagine the clouds suddenly bursting into a storm showering sand instead of rain? Or rocks blooming into beautiful flowers?
When HaShem created the world, He established the laws of nature and set rules for each of the creations.
Everything has its function and manner of being.
Man and Woman are the most important of all the creations and HaShem gave each one their own nature and unique qualities.
Women are special in a different way than Men are.
The Torah wants each creation to express its own special nature in its own special way. There are many Mitzvot that apply to all Jews, however, there are some commandments given specifically to men, while others were given only to women.
This Negative Mitzvah encourages a Jewish woman to preserve her own unique qualities in the way that she dresses. She is not allowed to wear clothes or articles that are considered to be men's garments.
In continuance... I would like to be clear that I was not talking of immodest clothing or clothing that represents paganism or any other form of ungodliness.
Those issues are clear cut and no culture can change what should be done in that situation.
But the specific Items such as T-Shirts which were made for the French Army men and then was adopted by the American Army....yet everyone lets women wear them...is this not a double standard for those who say that pants are exclusively for men and women should not wear them because they were originally a man's piece of clothing?