It's disturbing that anyone needs to write a manifesto defending women's pants, but I'm glad Simcha has stepped up to the plate. Clip 'n' save for the next rant you encounter.
I happen to be pretty comfortable in a long-ish skirt a lot of the time, even here in Minnesota (hint: Italian wool stockings), but yeah, it's not a moral issue.
The whole male-female pants-skirt dichotomy stems from needing to pee comfortably in the woods, anyway. On the subject of which, incidentally, I recommend Chapter Six of this book. And yeah, a hiking skirt does help.