Simone Chavoor was tired of walking into work with an "ugly backpack from Amazon" on her shoulders. So the 43-year-old media professional went looking for an upgrade on eBay. She found one in a vintage Coach Beekman briefcase in the British tan colorway. It wasn't perfect, by any means. Its leather was dry, and its hardware had become dull. The "project bag," as collectors would call it, needed work. But Chavoor — who said she bought the bag for "less than a dinner for two at a mid-range