Which product design innovation from the 1920s was originally marketed as a luxury health and beauty item but eventually became a household necessity?

Throughout history, product design has evolved dramatically to meet changing consumer needs and technological capabilities. Some products we use today have fascinating origin stories that reveal much about the societies that created them. This trivia question explores how one everyday item transformed from a specialized tool for the elite to a mass market product that changed history.

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Electric refrigerator (originally marketed as an electric 'cold closet' for preserving beauty products and medicines)
Vacuum cleaner (originally sold as a premium health device to remove disease-causing dust from wealthy homes)
Electric washing machine (initially advertised as a beauty treatment device to keep ladies' hands soft and unmarred)
Hair dryer (first sold as an exclusive salon treatment device for the upper class before home versions appeared)