Double denim is so a thing, but want to know what’s even more of a thing? Wearing two contrasting shades of blue denim together. Victoria Beckham says her autumn line is all about saturated deep indigo + '70s blue washes mixed together (can we just get a Pantone number to clarify those exact shades please VB?). Check out this set of cool girls who are stylishly working the two-tone look already.