Teens' behavior is an extension of how their parents learned to shop since 2008 when retailers pushed discounts to entice people to buy during the downturn. This has cut into sales from July through September, the second biggest shopping period of the year behind the winter holidays. Sales during that period were 24.9 percent of total sales annually last year, down from 25.8 percent in 2003.
"Consumers are sending a message to retailers that says 'the back-to-school shopping season just isn't that important anymore,'" says Deloitte's Alison Paul.
Typically, promotions would end around Labor Day, they're now extending them through September. They're also pulling together complete outfits from different brands in stores to make it easier for teens to buy looks. And they're using social media campaigns to be more easily discovered by teens.
To observe teens' new behavior, the AP followed Pugliese. With her were her cousin, Arianna Schaden, 14; and two friends, Isabella Cimato, 17, and Sofia Harrison, 15. The were at Roosevelt Field mall in Garden City, N.Y. Here are some ways teens are shopping differently, and how retailers are adjusting: