LUNCH LINES: Banana Republic creative director Simon Kneen and “Mad Men” costume designer Janie Bryant didn’t get much sleep the night after the retailer hosted the season four premiere of the Emmy-winning show. The duo was back at the Sunset Tower Hotel the next day to host a luncheon celebrating their second collaboration on the “Mad About Style” campaign, which schools shoppers in the finer points of 9-to-5 and cocktail hour dressing. “We met for the first time when filming video blogs for the campaign, and we hit it off so well that AMC better watch out, we may be doing our own show,” laughed Kneen. Meanwhile, Bryant shared some tricks of her trade, such as using upholstery fabrics to achieve a vintage look for her costumes, and altering collars and sleeves from rental house pieces. “They win out in the end, because, for every one piece that gets lost or damaged, we have to give them five of our costumes,” she said.