Polish model Ola Rudnicka, after A Show, Paris, September 2016.
Love Ola's pristine white turtleneck under her ribbed v-neck sweater. Great look! 
Recreate Ola's look (kind of):
J.Crew Tissue Turtleneck, Vince Long Sleeve turtleneck, ATM Anthony Thomas Melillo Long sleeve Mock Neck top, or The Elder Statesman turtleneck sweater
V-neck sweater — Acne Studios Deborah L Sweater, or Helmut Lang Distressed sweater