Exhibition reveals undergarments both the practical and sexual reasons for their use

Think of it as Victoria's (and Albert's) secret. London's Victoria and Albert Museum has peeled back fashion's layers to expose everything from long johns to lingerie in Undressed, an exhibition tracing the hidden history of underwear.

It's a story about covering up, and also about showing off. For centuries, people have worn undergarments for practical reasons of protection, hygiene and comfort - but there has always been an element of sexuality and drama as well.