Lululemon (LULU) shares tumbled post-earnings despite a strong showing from international sales. John Harmon attributes the decline to weakness in the U.S., where the athletic apparel retailer's seasonal color sales underperformed. Harmon notes that while tariffs may have contributed to the earnings miss, they're not the primary driver of Lulu's issues. As Lululemon prepares to report Q2 results, Harmon expects analysts to press management on the company's holiday outlook, its fastest-growing market in China, and its plans to address the ongoing trade uncertainty.