As said on Net-a-porter:

"Matthew Williamson is the ambassador for bohemian chic, producing lavish, ultra feminine wear with ethnic adornment for the jet set. Stay true to his vision and team this cocktail dress with tribal accessories, throw on gladiator sandals and oversized shades for an of-the-moment look."

um yeah. so i can't afford this dress and probably, neither can you.
but it can be easily replicated using any bright, deep earth tone, whether orange, sienna, or a good brown, and a statement necklace and gauzey scarf. (via Net-a-porter)