NEW YORK (AP) — Amazon is hoping to claim more territory once held by department stores, essentially placing a dressing room in your house.

The company, which has been making a big push into selling clothes, is testing a new service that lets members of its Prime program try on styles before they put items on their charge card — at no upfront fee. Customers have seven days to decide what they like, and then pay only for what they keep. Shipments arrive in a re-sealable box with a pre-paid label for returns.

More than a million pieces of clothing and accessories are eligible, Amazon said Tuesda...