Yoyo Cao of Yoyokulala, after Balmain, Paris, September 2016.
Love a cutout/backless shirt/sweater/blouse! 
Recreate Yoyo's look (kind of):
Open-back/cutout blouse — Dion Lee Cutout striped cotton-blend poplin shirt,  Palmer Harding Open-back flocked cotton-blend shirt, Victoria Beckham Open-back cotton-poplin top, R13 backless shirt, Sandy Liang Enzo open-back ruffled striped shirt, or Off-White c/o Virgil Abloh Striped Cotton Open-back shirt
Jeans — Saint Laurent boyfriend jeans, Topshop loose fit jeans, Elizabeth and James Boyfriend jeans, or Re/Done High Rise Ankle crop jeans