Who'd have thunk it from Marks and Sparks?! Everyone cooing over the costumes from Mad Men right now, and good old M&S have managed to bring us a fab interpretation of Peggy's gorgeous checked dress for only £45. Sadly it doesn't have the asymmetric buttons or the rolled collar, but you do get the wiggle shape, black check and on-the-knee hemline. Finish the look with pearls, a ponytail and some black courts, and you're all set to take on the boys in advertising!