Track Pants Grace Runways as Activewear Goes Up-Market

Baseball jackets and cashmere track pants will vie for the spotlight alongside more traditional evening gowns and fur coats at New York’s fashion week as designers seize on shoppers’ growing penchant for athletic wear.

The fashion world has woken up to a trend that’s driven strong sales at Nike Inc., Lululemon Athletica Inc. and Under Armour Inc. for the past couple of years: increasingly, men and women are trading in jeans for sweatpants, yoga gear and shorts and unapologetically wearing them anywhere and everywhere.