Fashion Consultant Yasmin Sewell, before Derek Lam, NYC, September 2015.
A beautiful way to dress down a full length lace dress: add a blazer, extra long belt and flatform sandals. 
Recreate Yasmin's look (kind of):
Loewe large suede pouch 
Flatform sandals: Prada Crisscross Espadrilles, Flamingos Malabar leather slingback sandals,  Miu Miu suede espadrilles, Vince Mana flatform sandals, Barneys New York crisscross strap flatform sandals, Stella McCartney Platform Espadrille sandals,  Aldo Glori black flatform sandals, Michael Michael Kors Darby sandals or Topshop Wave Flatform sandals
Boater hat: Eugenia Kim Brigitte woven hemp boater hat, Hinge Straw boater, Eric Javits Gondolier boater hat, Lanvin straw boater, Eugenia Kim Marcel boater hat, or Gladys Tamez The Gloria straw boater