One of the pleasures of writing FAREWELL MY LIFE is that I got to imbibe all the wonderful fashions of the early 1920s.
Compare the tennis outfits from the 19th Century:
to the “indecent outfit” from the 1920s:
After World War I (1914-1918) fashion became driven by young people. Partly it was because young women had a different conception of what they needed in clothes. For example, they wanted to play a much harder game of tennis than their mothers and grandmothers with over-arm hits to the tennis ball, much like modern tennis today.
Can you do that in corsets? Of course not, which is why young women ditched corsets and stays in favor of much lighter underwear, which allowed them much more freedom of movement.