But her good friends clearly aren't telling her.
There was a woman in her late 40s in my hairdressers wearing leggings. She looked fine from the front but at the back where they were a bit stretched, you could see right through. Now, I would contend most normal women don't want to be walking around showing off their squashed, utilitarian and imperfectly positioned underwear. But at the same time I don't want to be rude nor make her feel uncomfortable. So I waited til her hair was finished, she has her coat on and she'd left the shop. Then I ran after her, where no one could hear, and I quickly mentioned it and ran back inside. She'll see me again and I've given her the hope that no one else she knows has ever noticed.
I can't tell Meghan in person or I would. She's ruining the line of her beautiful clothes and I think a moment of embarrassment is worth a lifetime of confidence in and admiration of your style.