Sports wear for some has not been that much of a change, the knee shorts and the "vest" look is similar to the 1930's look.
amazing tennis wear
Tenue de tennis début des années 20
France Gall wearing 60's Courrèges ou Pierre Cardin - Bobbins and Bombshells: Fashionable History: Tennis, Anyone?
Motor magazine featuring tennis wear, 1923.
Vogue Italia I http://mode.newslicious.net/
McCall 8139 - Ladies' and Misses' Sports Dress 1935
Tennis fashion for girls in Seventeen magazine 1976 (Blondes were actually…