"Barneys has been there from very early on," said the designer. "It's not a partnership, it's a friendship."
The party was the must-attend New York Fashion Weeksoirée and Ashley Olsen used it as an opportunity to test drive a piece from her forthcoming solo fashion line, The Row.
The fashionista wore a cropped navy blue and hunter green plaid jacket which was a hip and modern take on the 'boho' look she made famous.