The economic boom of the second World War ended the depression but dampened fashion.
1930's style clothes were still being made and worn but the new styles were noticably different. Clothes started to imitate uniforms, styles simplified, hemlines rose to save fabric and stockings were scarce or unavailable. Mens fashion still held fairly steady.
Build quality stumbled and never quite recovered. Colour palettes began to lose their sophistication and subtlety. Fabrics were never the same again. The intensification of industrialisation that came with the war spread everywhere including to clothing.
The post war New Look began suddenly around 1947 and spread quickly through Western society. Styles and attitudes to clothes changed which continued into the 50’s