NEW YORK.- This undated photo courtesy of The Museum at FIT shows a Manolo Blahnik boot, a high-fashion version of a hunting duck boot, 1994, England, gift of C. Hooper, on display at The Museum at FIT in New York. Some of the most fashion-forward looks take teamwork between the designers of athletic sportswear and runway worthy couture. It’s what led to bikinis, bike shorts, tennis skirts _ actually skirts that hit above the ankle, in general _ and the popularization of stretch fabrics. AP Photo/The Museum at FIT, Eileen Costa.