The French fashion designer Coco Chanel was very influential in creating the new styles.
I think though that probably WW1 had something to do with it. Many women from the upper and upper middle classes - the women for whom expensive new fashions were normally created - had done war work during WW1, most of them the kind of women who would never have dreamt of taking a job before the war. Unlike poor women, who had always had to work, this would be a new experience for them. Some of them worked at jobs where a simpler style of clothing, shorter hair etc, would be an advantage, and some of them even wore trousers, if they worked in farming, forestry, on the railways etc. This probably encouraged a trend towards simpler, less voluminous clothing.
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The French fashion designer Coco Chanel was very influential in creating the new styles.
I think though that probably WW1 had something to do with it. Many women from the upper and upper middle classes - the women for whom expensive new fashions were normally created - had done war work during WW1, most of them the kind of women who would never have dreamt of taking a job before the war. Unlike poor women, who had always had to work, this would be a new experience for them. Some of them worked at jobs where a simpler style of clothing, shorter hair etc, would be an advantage, and some of them even wore trousers, if they worked in farming, forestry, on the railways etc. This probably encouraged a trend towards simpler, less voluminous clothing.