"Your skirt's too sheer."Within seconds she was gone and returned later with a different one on. She was very grateful and explained that in the rush to get out she hadn't realized which she was wearing.
Most men have stories like that concerning their zippers, which may be open or with the shirt stuck. Buttons sometimes have a life of their own and open up. And of course we may not be aware of rips and stains. Sometimes wardrobe malfunctions are easy to repair, and sometimes they aren't at all.
One thing for sure. I've decided not to be shy about informing people who are most probably unaware of the malfunction. I'm certainly happy when people tell me. It may be embarrassing to hear it, but to think that I've been walking around like that is certainly worse.