It may be real or it may be a Photoshop wonder, but there is something very interesting about the idea of clothing that makes you look naked or as if you are getting a peek at something meant to be concealed.This also made me think of the entire genre of porn featuring women with extreme tan lines, playing on the sexual charge of seeing something meant to be hidden. Sex is all about tension...does this type of tension turn you on?
To learn more about the naked clothing: http://www.trendhunter.com/trends/invisible-clothes
To learn more about tan line porn: Let the Internet be your guide.