I was at the shops Christmas Eve and returning some packages to the car when I realised that I could see the backside of the woman walking in front of me. As in, her dress had a sheer panel about 10 cm wide running around out at about the point where her bottom was widest (not that it was WIDE just at that height). Anyway, after following her for a few minutes, idly wondering why on earth someone would choose that particular look, I realised that actually she may have been having a wardrobe malfunction, due to the type of dress it was. I debated telling her for a moment but hesitated because I couldn't be sure it wasn't deliberate. Then when I decided, based on the other thread that yes, I should tell her and risk the foot in mouth, she left the shopping centre for the car park.
Given that she was leaving I changed my mind and kept my mouth shut. Was that the right thing to do?