According to research by Coresight and reported by WWD, Amazon has overtaken Walmart as the largest apparel retailer in the US. Apparel has now pushed ahead of books, beauty and electronics on the Amazon site. The private label offer is partly responsible with the company now offering over 4900 private label products. Only Nike, Under Armour and Adidas rank higher than Amazon's private labels collectively. A large number of Amazon apparel customers have switched from department stores such as Macy's, JC Penney, and others like TJ Maxx and Marshalls in particular. On the other hand, the penetration rates for apparel shopping among Prime members may have peaked which means that Amazon will need to increase average spend and frequency of purchase.