AUBURN HILLS, Michigan -- Besweatered Sergio Marchionne has issued an internal memo requiring all Chrysler white-collar employees to wear white collars. And suits and neckties for men. Suits or pantsuits for women. The new requirement represents a major policy reversal from the man who turned around Chrysler after its 2009 bankruptcy. Marchionne is known for his black sweaters, worn over open-collar shirts. One source says Marchionne hasn't been seen wearing a suit since Pope John Paul II received him at the Vatican in the mid-1990s. The 60-year-old Marchionne told employees in the email memo that he would adhere by his own requirement.