A growing number of traditional brick and mortar retailers are setting up dedicated Amazon storefronts. Nike, Victoria's Secret, J. Crew, and The Children's Place are some of the well-known brands that have also created Amazon storefronts. Unsurprisingly, Amazon gained 1.5 percent of the U.S. apparel market in 2017, making it second only to Walmart. Here's a look at why so many retailers have made the leap and how consumers benefit.