Irina Lakicevic, before Valentino, Paris, October 2015. 
Oversized shirt. 
Recreate Irina's look (kind of):
Studio Nicholson Teddy oversized shirt,  MiH Jeans The Oversized shirt, Vetements oversized cotton shirt, Monki oversized Boyfriend shirt, Topshop textured collarless shirt, Topshop oversized button front shirt, or Giambattista Valli oversized shirt