What should I do if I see someone else's pants zipper open in business?

If I saw a lady, I would walk up to her, close to her ear and tell her that your zipper is open.

If I was watching it for a man, I would tell him. Just in a different way. I decided that whoever it was should tell each other. Don't be embarrassed. I remember a joke that said: A female colleague saw the boss's zipper open and there were many people beside him. She was embarrassed to say it. Ask the boss: "When you got off the bus, the door was not closed properly, was it?" Isn't this also a way? But the most certain thing is that you must tell that person.