Hi costume historian here. I have two degrees to prove it.
So you think fashion were modest pre feminism during men's "guidence" or more comment know as surpression.
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Meet the late 18th century fashions of Europe and America, observe the low bust line, notable for the use of nipple reveal
Maybe this was a one off? You would be wrong.
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Meet Pauline Bonaparte sporting post french Revolution fashions. Regency fashions were known for their light often sheer material that emphasised the bust. Known for their tendency to reveal a ladies attributes.
Perhaps we can step back a little farther. To the 17th century.
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Restoration fashions in charles II court were very much about free the nipple.
Or maybe to the medieval era for some sweet boob action
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And don't get me started on the Roman and Grecian habit of public nudity or lack of dress.