Greta of Greta Guide has produced this excellent video on the need for and the growing importance of sustainability in the fashion industry. It features interviews with industry insiders who point out that sustainability is no longer a trend or a niche market, but a movement.
One sign of sustainability in mainstream fashion is what David Wolfe of the Doneger Group referred to as the death of trends in a recent trend forecasting presentation. He points out the variety of skirt lengths and styles of pants and blouses offered by designers every season has made the concept of things being "in" or "out" irrelevant. With this absence of strong trends, consumers no longer feel the need to buy new wardrobes seasonally. Of course, this has not entirely slowed-down the pace at which apparel is purchased, especially with the enticing low prices of fast-fashion retailers, but the idea of sustainability is gaining more and more acceptance and could be the biggest shift in fashion since the advent of mass garment production.