. A grandad-collar shirt like Officine Generale's 'Gaston' style is perfect if you want to look smart but relaxed at the weekend. Made from light, breathable cotton-blend seersucker, it's cut for a slightly loose fit and fastens with pearlescent buttons. Match the pinstripes to navy chinos or indigo denim. Wear it with: Acne Studios Trousers, J.M. Weston Sneakers.