Kohl’s shoppers have a message for incoming Chief Executive Ashley Buchanan : Bring back the old Kohl’s. To chase younger shoppers and reduce inventory, the department-store chain in recent years scaled back fine jewelry, petite clothing sizes and popular private-label brands to make way for Sephora cosmetics and Babies “R” Us shops inside its stores. The moves upset some longtime customers and sent Kohl’s sales into a nosedive that wiped out more than half a billion dollars in revenue over two years.