Aimee Song of Song of Style, after Christian Dior, Paris, October 2015.
The shape of Aimee's fitted gilet is fantastic especially with the tiny plaid mini skirt. 
Recreate Aimee's look (kind of):
Fitted-ish vest — Balmain double-breasted basketweave vest, Rosie Assoulin Les Moons boucle a-line gilet, The Row Elena Halter Vest, Protagonist Twill vest, BCBGeneration Tuxedo vest, Proenza Schouler Crepe & Cloque double-breasted vest, Iro Wallony twill vest, or Akris cotton voile gilet 
Plaid mini skirt: Victoria Beckham Denim plaid wrap mini skirt, Shrimps tartan-check mini skirt, ASOS a-line mini skirt in check, Opening Ceremony Marny knit utility mini skirt, Topshop brushed check high-waisted skirt, Lush plaid tweed mini skirt, or Topshop plaid tennis skirt
Block heel boots: Givenchy Prive embellished boots, or  Maison Margiela leather ankle boots