Swedish brand Fjällräven is no stranger to designing rugged hiking pants, but we're used to seeing a more traditional design ...

Chic celebrities and fashion people have been wearing them with trendy flat shoes instead. Hailey Bieber was a notable recent example of this when she paired her leggings with elastic-strap ballet ...

But leaving a pilates class in L.A. over the weekend, Bieber wore her black ankle-length leggings with a flat shoe trend that made her outfit look far prettier than sneakers would have ...