The next big trend in fashion will bring about the end of clothing as we know it. Instead, the future will bring around a sophisticated sort of plastic surgery that will allow people to modify their bodies, quickly and reversibly, based on their needs.
When shoes are needed, a spray will harden the bottoms of feet so that people can walk over any surface without injury. When coats are needed, a different spray will provide a growth of fur. And on like this: heads sculpted into hats, legs covered with feathers, torsos covered with scales, all dependent on our needs, all instantly available and instantly reversible.