9 INSTA-SHOPS: WHERE YOU’LL FIND MUST-HAVE VINTAGE PIECES You can now build a killer wardrobe via DM. LAUREN CARUSO Photo: @girlsofmars_vintage/Instagram   Instagram, aka America’s favourite pastime, got a lot more all-consuming this past year: Not only can you mood-board to your heart’s content with the introduction of Collections, but you can also make live