Cara Delevingne, Lou Doillon and Rihanna are massive fans and now it's officially trending at Paris Fashion Week. What is it? It's the slouch. Think of it as an evolution of the pyjama shirt and your much-loved dungarees because they have paved the way for the slouchy top-to-toe trend. We're not talking Kigu-comfy here: think boiler suits (seen here, left, on the street) and classy oversized tops and trousers in luxe fabrics. As you can see, French actress and model Marine Vacth (right) has got the look down.