MillionTalks: Celebrity Sunglasses This Summer - MillionTalks

Hi,

I have been looking this summer into which celebs have been wearing what, sunglasses seem to be something they use to cover their appearance etc... depending on mood. You see Cherly Cole wearing big sunglasses to hide and others like brad pitt looking extra slick. I think the pair that seem to have been worn by everyone is the ray ban avitor I am trying to wonder and work out how this simplistic design has stayed at the forefront of fashion design for soooo many years??

Any thoughts on why this is?