Double Dip?

Yesterday night I was driving home with my sister. I told her when we got home, I planned to clean. (By Laura standards, my house was a disaster zone- total pit.) She said she needed to do laundry because she was out of clean underwear and went onto say how she has to do laundry always based upon running out of clean underwear. So, I asked her, jokingly of course, "Don't you wear them twice?" She then proceeded to act completely disgusted and then went on to say she doesn't "double dip" her underwear... I think she MUCH FURTHER crossed the gross line than I did-- she blamed it on a cartoon where the example was a kid going into a hamper for a pair of dirty socks. I think I'll stick with double dipping my jeans, rather than socks or underwear.