We may have spent the winter with “Downton Abbey,” but spring 2012 is all about the return of “Mad Men” (March 25th!) and with it the celebration of 1960s' style from lady-like floral prints to sexy sheath dresses in modern fabrics. “Mad Men” Costume Designer Janie Bryant and Banana Republic Creative Director Simon Kneen introduced their much-anticipated spring collaboration at the L.A. home of Kiernan Shipka, aka Sally Draper, who gave her white “Draper dress” a personal touch. The collection's vibe is country club-casual as opposed to the sleek and minimal work wear seen in the halls of Sterling Cooper Draper Price. As Bryant notes, each of the 40 pieces --there's clothing and jewelry-- is inspired by a particular “Mad Men” character, so grab your martini, pick your favorite, and start shopping!