Agent Provocateur in New York's Soho is using human female mannequins in store windows. Consider it similar to the Red Light District in Amsterdam done tastefully.
At first glance, it's hard to tell whether the women are real or not. Covered in a white powder, they look as though they are fake, but then a deeper look at their expressions makes one take a second look. The revealing factor is when they move and strike a different pose.
It's hard to be certain if this method is cost effective for Agent Provocateur, but as a business model, the female mannequins sure make viewers want to try on the lingerie. Not only do viewers see what the nickers look like on a real woman, but the women exude a sense of happiness, making potential buyers feel the love associated with the clothing.