Margaret Zhang of Shine by Three, after A Show, NYC, September 2015.
Layer, layer, layer: skirt over trousers, knotted belt over skirt.  A very cute, playful look from Margaret. 
Recreate Margaret's look (kind of):
Olive green tee — Helmut Lang Distressed jersey t-shirt, Re/Done 1960's Slim fit t-shirt, Topshop Soft Washed tee, or Citizens of Humanity Premium Vintage Esmay t-shirt
Denim skirt — Frame Antibes stretch-denim skirt, Topshop Moto Denim Embroidered skirt,  Jour/ne Denim mini skirt, Gucci Appliqued denim mini skirt, Marc Jacobs Embellished appliqued denim mini skirt, Glamorous Embroidered Denim skirt, Balenciaga Pleated hem denim skirt, or Kenzo Stone Washed denim skirt