At the request of Barneys New York, more than two dozen of the world’s top designers, designed ensembles using organic fabrics, natural vegetable dyes and technically advanced fibers derived from soybeans, bamboo, banana leaves or hemp.

Even the runway was made from long slabs of wood that was borrowed from Tucker Robbins, the furniture designer, and would returned after the show to be made into dining tables.

Three years ago, when Earth Pledge put on a similar show, it had almost no impact. But when Julie Gilhart, the fashion director of Barneys, began asking designers to participate this year, the response from top names like Donatella Versace, Donna Karan and Stefano Pilati of Yves Saint Laurent was immediate.

“Sustainable fashion has all the makings of a trend,” Ms. Gilhart said, “but we know now it’s a movement.”