Lululemon Athletica (LULU 0.68%) has likely helped mint a few millionaires since its public debut in 2007. A $20,000 investment in the Canadian yoga and athleisure apparel maker's initial public offering back then would be worth about $1.02 million today. The company has carved out a sizeable niche in the market with its high-end products, fostered brand loyalty with free yoga classes and other events, and expanded its direct-to-consumer business to curb its dependence on wholesale retailers.From fiscal 200 ...