The Utility Vest Mini Dress Mushroom by Wynn Hamlyn. 

Tailored mini dress featuring flap pockets, a concealed front placket, and Wynn Hamlyn buttons. Delicately lined for a comfortable yet chic fit.

Main: 75% Polyester, 19% Rayon, 6% Spandex
Lining: 55% Polyester, 45% Viscose

Model is wearing a size 8 and is 173cm tall.