GAW: some argue on R’ Wosner with this. My Rosh Yeshiva told me that years ago, the first women who wore pants were not allowed to because it’s a beged ish. Now, however, there are pants made specifically for women, and it is normal for women to wear them. Therefore, it is not a beged ish anymore. He said it is a problem of tznius because women’s pants are made to accentuate certain body parts. However, he said that theoretically, someone could make pants which don’t show off the body, and they would be 100% ok for a woman to wear.
I am aware of this, but most of the Yeraim Olam is Noheg/Paskens like Rav Vosner.
P.S. “Showing off the body” needs its own source (IMHO, it is Das Yehudis and included in “Vered”, which is dressing or acting in a manner that shows the girl is “available”).