Using seemingly unrelated colors together is a core concept of prep dressing as well as the English style that prep is related to. Such combinations look as though the wearer did not care about this clothes. And, as I have written before and will write again, that should be an objective for each day's ensemble, no matter how long it takes to achieve. After all, since the 17th century the masculine look has derived more from uniforms and the uniformity of black and white evening clothes than it has from the peacock dress that came before. And though green, lilac and navy combinations like the one in the photo are definitely not uniform their carelessness gives much the same impression. And look good at the same time.
Photo: Sergei Sviatchenko for Up Close and Private