The retailer is stuck with rising costs as U.S. tariff policy eats away at the bottom line.Athletic apparel retailer Lululemon (LULU -18.59%) was already facing multiple issues before U.S. tariff policy was turned on its head by the Trump administration. The company has been slow to innovate, and its stale product lines have opened the door to competition on multiple fronts. At the same time, younger consumers are moving away from the tight leggings that have defined Lululemon's brand.The company's turnarou ...