Also, they should "avoid exposing bare fleshy under curves of the buttocks."
Plus: Megan Fox can't stand the creepy, old rich guys at awards shows, and more, on our daily late-night roundup.
What's the verdict? Half-slip?
Last Night on Late Night: The Office's Mindy Kaling Survives a Wardrobe Malfunction on The Late Late Show
Plus, Julianne Moore tells David Letterman about the chronic masturbator who befriended her on an airplane, on our regular late-night roundup.