Clothing of the Future! Eve, A.d 2,000!

Why are the clothing forecasts for the future, any future, always so far off-base from reality? In the year 2000, did anyone find even one woman wearing a streamlined flashlight on her head, unless she was perhaps a coal miner? Or convertible dresses, electric belts that adjust to climactic changes, dresses made from glass or aluminum, and so on.