Whether you're climbing a mountain or a barstool, you'll be glad you're wearing it. Wool-and-down jacket ($1,495) by Moncler; cashmere sweater ($697) by Paul Stuart. From the December 2012 issue.

Down jackets and puffy, feather-filled winter wear dominated the runways this season – from Demna Gvasalia’s reinvention of the puffer for Balenciaga to the Moncler Genius programme’s daring ...