benignuman: Agreed about the pants. My Rosh Yeshiva, R’ Yaakov Bender, once told me that the first women to wear pants transgressed lo yilbash. But now that pants are made specifically for women, it is no longer lo yilbash for a woman to wear pants. Instead, it’s a question of tznius – pants tend to accentuate certain parts of the body, and that is not allowed.
Another Rebbe told me that wearing very loose pants (such as culottes) might actually be allowed. They are definitely more tznius than a tight skirt.