When it comes to Summer dressing, black is the new white.  Black is not always first choice for summer dresses, pretty much every colour will come in front of it in our mental lists, but I think this is a mistake. Black is always chic, looks great against a suntan, covers all manner of evils when you’re having those not-so-perfect days bodywise, and is basically a classic choice, even (or maybe especially) in summer. This summer, with summer balls and prom season almost upon us, I think we should take inspiration for our dresses from two major sources. First up is Madame X, as painted by John Singer Sargent. This…