Peony Lim, before Burberry, London, September 2012.
Need to pare down a dressy-up dress? Wear a leather jacket draped over your shoulders like Peony has (instead of a coat or wrap), and add an oversized clutch. 
Recreate Peony's look (kind of):
Valentino Rockstud clutch, Mara Carrizo Scalise large envelope clutch, Clare Vivier Fold Over clutch, or Miu Miu Grained leather clutch
Leather jacket: Proenza Schouler leather biker jacket, Lot 78 biker jacket, ASOS leather biker jacket, or Topshop clean biker jacket