Helena Bordon, after Marc by Marc Jacobs, NYC, February 2015.
A shorter version of the sailor pant (Caroline's longer pair of nautical inspired pants here).  
Recreate Helena's look (kind of):
Sailor culottes: Sacai Luck wool wide leg culottes (in camel) or in navy, Camilla and Marc Freedom culottes, or Valentino two-tone denim culottes
Gucci horsebit-detailed patent boots
Striped sweater: Isabel Marant Hatfield striped sweater, The Elder Statesman Picasso striped sweater,  Only Striped knit sweater, Balmain striped sweater, Iro striped turtleneck sweater, Alexander McQueen Striped sweater or Karl Lagerfeld Dana striped sweater