Oh do I have a story for you!!
Last time I tried to warn a female of a wardrobe malfunction was at the gym about a year ago. She had on some yoga pants and was doing so deadlifts, so of course I was staring. That's when I noticed they happen to be slightly transparent every time she'd bend over. I also noticed EVERYONE else staring and kinda snickering at it. So I thought I'd be her white knight, and discreetly inform her of this mishap and save the day. Boy was I WRONG. She gave me the look of death and berated me, and proceeded to storm out of the gym. From that day forward, I have never talked to another person in the gym. I just mind my own business.