I've only seen it attributed to Chanel, too. But as bo points out, she was often wearing tons of pearls (by today's standards) but then a much more simplistic style than earlier Edwardian fashion.
The article in last weekend's Telegraph magazine about Clare Waight Keller (amusingly just before an article about the sparkly Strictly costumes), she's working the black, leather shine in this photo, too. A quote about her moving to Paris in 2012 and getting her head around Parisian style "Parisians are very specific. They never look as though they're wearing too much make-up. They don't wear nail polish, or if they do it's red. It's all about looking effortless, chic and elegant. If it's cool, it has to be the right kind of cool."
Elle that sounds extremely annoying about Sezane.