Millennials have a new shopping preference that should terrify Lululemon and Athleta

Mallory Schlossberg/Business Insider Young Americans may have fallen out of love with yoga pants. The dominant apparel trend of athleisure seems tohavereached its peak in the second quarter of 2017. Athleisure is the trend of buying athletic apparel for its unique properties — sweat-wicking, stretch, comfort — without necessarily intending to use it to work out. Athleisure has been huge for the last several years.According to The NPD Group, US activewear apparel sales totaled $45.9 billion i...