We have to admit: We were a bit skeptical when we noticed cardigans slipping into the fall 2017 collections. Sure, Helena Christensen's turn on the catwalk at Perry Ellis' '93 show makes a fantastic case for the button-up knit, layered over her checked slip dress, hair tousled, lace-up boots a-stomping. But now? How are we to wear the cardigan in 2017?