Levi Strauss & Co. announced plans to cut up to 15% of its global workforce as it restructures under new leadership.  The cuts are part of the company's global productivity initiative and are expected to take place over the first half of the year under incoming CEO Michelle Gass. The company is trying to rapidly tighten its belt as it contends with macroeconomic challenges and ongoing issues within its U.S. wholesale business.  "There's been a lot of volatility this past year, some in our control, some outs ...