There are good reasons why men shouldn't wear them too, at least without some kind of top covering the hip region.
When a woman reaches maturity her pelvis typically asssumes a characteristic shape- this is an allurement to men and pants on women in contermporary times nearly always accentuate this allurement.
Which is why I favour the wearing of a long top or tunic over trousers.
I don't really want to spell out why it is in a man's interest for him to cover the hip area as well.
Have you seen paintings of them? St Joseph is not wearing trousers! The biggest difference is that Our Lady is wearing a veil.
Those clothes are not the same.
Similar. Men's and women's trousers are not the same either.
So far you have not admitted any reason why opposition to women in pants may have some validity.
Why should I admit something I am not convinced by?
There is a contradiction.
On the one hand, women should not wear trousers because they are men's clothes.
On the other hand, women should not wear trousers because they are immodest and present an occasion of sin for men.
So men are attracted by women wearing men's clothes??
On yet another hand, men find women in skirts more attractive.
So, men are attracted to women "dressed as men", and also attracted to women dressed as women.
As I say, the matter of the women's hips can be addressed quite easily with a long top. So it need not be an issue.