When did it become socially unacceptable not to wear a bra and how

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What is the history of women wearing bras? When did women start and stop wearing them, and why? How much of this was due to fashion vs. comfort/health reasons? - Quora

Before clothes were invented what was it that made being naked out in public unacceptable to society? Or was it always considered unacceptable? - Quora

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History of bras - Wikipedia

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Do you ever wish that bras were never invented, or that they were better designed? - Quora