09/08/2012 09:31 EDT | Updated 11/08/2012 05:12 EST

Black, blue and white tell the story of Cushnie et Ochs spring fashion collection

NEW YORK, N.Y. - The Cushnie et Ochs spring collection was full of chic, sharp lines, but designers Carly Cushnie and Michelle Ochs didn't use a razor's edge to get them.

It was clean without the mean on this runway at the downtown Milk Studios at New York Fashion Week on Friday.

A group of white dresses — one a slinky jersey, one with butterfly sleeves and another with skin-baring slits on the bodice and seemingly held together at the bustline by a metal triangle — set the tone of relaxed elegance, while a parade of black dresses, dressier in silk faille and satin that emphasized sheath shapes and high waists, sealed the no-nonsense deal.

The finale was a black dress with an off-the-shoulder, diamond-cut neckline.

Sandwiched in between the black and white were the shades of ocean blue that have proved popular along with black and white at these seasonal previews.

Actress Kate Bosworth sat in the front row in a zip-front black number. She met Cushnie and Ochs at a Vogue-sponsored event in Los Angeles a few years ago and has been a friend and fan ever since. "They are the loveliest young women, and they are so talented," she said.