These brands you've never heard of are propelling Amazon to outsell Macy's and every other retailer

Amazon is making tracks into apparel with its private brand labels.

The e-commerce giant is going after department stores like Macy's, JCPenney, and Nordstrom in an effort to become the go-to place for apparel shopping.

According to a report by Cowen & Co from October 2016, Amazon is expected to surpass Macy's to become the biggest apparel seller this year. The company's clothing and accessory sales are expected to grow nearly 30%, to $28 billion. Macy's apparel sales, by comparison, are expected to drop 4%, to $22 billion, in the period.

But as a newcomer to the fashion world some of its private label brands are still relatively unknown. According to WWD, Amazon plans to build its empire with these eight brands: