I recently helped a female friend move out of an old apartment, and I was absolutely astounded by how much clothing she had lying around. It surprised me because she came off as a stylish, but not terribly fashion-centered person. By my rough estimate, this list represented probably 1/5 of my friend's clothing.
Granted, a sample size of 1 is not terribly informative; however, my gut feeling is that a women's wardrobe will generally be considerably larger than a man's wardrobe.
On an unrelated note, I love hearing about life hacks like these. Reminds you of how much else there is left to optimize.