It's no secret that Mad Men is one of the most influential shows on television, at least when it comes to fashion. And now the show's costume designer Janie Bryant has teamed up with Simon Kneen, Creative Director of Banana Republic, to film Mad Men-inspired style guides. In this one, the two experts discuss the key pieces behind the show's signature looks: the pencil skirt and vintage-inspired accessories. But Mad Men fashion isn't just a faded notion of matching your shoes to your handbag. Bryant says, "The resurgence of dressing up and dressing for the occasion is what Mad Men is all about." Watch the video above, and tell us what you think in the comments section below!