Preppy Goes Back to School

This fall, students are saying bye-bye to the Britney look and hello to tartans and tweeds

It's a sweltering day in New York City, and five teenage boys are selling bottles of Poland Spring water to drivers stopping at a traffic light in Harlem. Business is slow, so the boys--camped out on lawn chairs on the sidewalk--start bantering about fashion. "L-E T-I-G-R-E. Le Tigre!" shouts one of the young entrepreneurs to another as the rest of them look on in disbelief. "Don't you know what it is?"

For those who don't know, Le Tigre is a brand of polo shirt. And for a certain set of fashion-forward high schoolers, including these urban teens, it has become a...