A new episode of Mad Men premiered Sunday night, and we caught up with the show’s costume designer Janie Bryant to get the inside scoop on the fabulous retro fashions, including this sexy, sweetheart neckline dress Joan Harris (Christina Hendricks) wore for her night with Herb Rennet (Gary Basaraba). “That was actually a vintage garment,” Bryant said of the look. “It wasn’t about her going out to get a new outfit for an evening with Herb. It was sexy, but it had some understated qualities to it. It was more like a dinner dress.” Click through for Bryant’s take on more of last night’s looks, and catch the next episode of Mad Men Sunday, June 3rd at 9/8c on AMC.