Source: Amazon video

Amazon is beta testing a new perk for its Prime subscription program that may spell big trouble for department stores and other clothing retailers.

Amazon Prime Wardrobe allows members to order a box with three or more pieces of clothing, shoes and accessories to try on at home. They only pay for the items they keep while returning unwanted pieces for free. Amazon claims that more than one million items for children, men and women are included in the program.

Every order shipped includes multiple items that customers get to keep for seven days without charge — think Stitch Fix or Trunk Club without the personal shopper fee. If a Prime member purchases three or four items, they receive a 10 percent…