The postwar baby boom had produced 70 million teenagers by the time the 1960s came along. All of those hormones dictated some changes in the world of fashion. Long gone was the poodle skirt. Skirts in the '60s got shorter -- much, much shorter. Skirts and minidresses often came up four to five inches above the knee in the United States and an eye-popping seven to eight inches above the knee in the UK. While skirts got shorter, boots got taller. The most popular boot was the go-go boot, which was often white patent leather and went almost to the knee. Singer Nancy Sinatra and TV's The Avengers helped popularize the look.