Adding a blazer to your outfit is a surefire way to protect against any, inevitable, changeable weather this summer and there are a multitude of styles to choose from. Ubiquitous for a few seasons now, and showing no sign of disappearing, is the boyfriend blazer. Loose and long, the boyfriend blazer should look effortless, either thrown over skinny jeans and a vest or paired with a skintight dress. Alexander Wang added an aquamarine double-breasted number over matching shorts whilst Stella McCartney paired her chiffon blazer with a sequin bodysuit. More structured and smart is the collegiate blazer, fitted with cropped sleeves and cornerstone of that preppy look. Ralph Lauren Blue Label pair their demure navy versions with polo shirts and chinos whereas Chanel paid tribute to Coco herself with their tweed twin-set in palest pink.