One of the best ways to give your look an update, is to throw out (or to be less extreme, put away) your sunglasses and invest in a new pair. They give new life to old outfits and are an easy way to tap into a new-season trend. This week, three of our favourite sunglasses labels, Preen, Karen Walker and Le Specs, all launch new collections. Our favourite? Too hard to pick. But one thing we did notice is that this season, classics are being traded in for colours, patterns and 3D embellishments.