That’s a nipple slip.
Here’s Playboy model Jenna Bentley on a photo shoot in Hawaii which makes absolutely no sense to me. 1.) I thought Playmates only spent their time pretending Hugh Hefner’s penis works. 2.) What the hell were the instructions on this set? “Now make sure you only let one gigantic tit pop out. We want to keep things fancy.”
NOTE: Full Size versions are NSFW.