Haha I don't always wear them with short skirts either. The only time I think they are absolutely necessary is when I'm wearing a short skirt or dress and I plan on going out and drinking or something. I feel like drunk me is probably not very good at keeping my lady bits hidden.
But I was wearing these today http://de.calvinklein.com/store/de/damen/damen-unterwaesche/damen-hipsterpanties/hipster-panty---perfectly-fit-0000f3844erg1--3
Just plain old, boring white briefs. It would be much preferred by me if I were wearing women's undies right now, but I have none. P.S Send me a message, ladies!