Cindy Crawford dominated '90s runways and magazine covers, oozing sex appeal with her mile-long legs , "unforgettable" red lips and famous mole . Decades later, the Midwestern beauty hasn't allowed body image and aging pressures to stop her from baring it all , though she admits that she feels just as sexy when wearing clothes.

The supermodel and Meaningful Beauty founder spoke with The Huffington Post at a launch to promote her new book Becoming on Tuesday, and revealed why she chooses to "air on the side of sophistication."

"Sexy is a feeling," said Crawford. "You can be sexy wearing your boyfriend's jeans and white shirt. I think especially as you get older, that you don't wear it on the outside."