Women should be allowed to go topless if they want to. Up here in Canada, we're trying to change it so public nudity is not a crime or even a felony (I think).
I think the only reason it's lawfully unacceptable is because technically, a woman's breasts are considered genitalia. The only reason it's socially unacceptable is because of the long running idea of "modesty", and by extension, breasts have been associated with very intimate relationships.
So breasts were associated with sex which means that parents don't want their children learning about/seeing sex and try to keep exposed breasts away from them at all costs.
I think the only reason it's lawfully unacceptable is because technically, a woman's breasts are considered genitalia. The only reason it's socially unacceptable is because of the long running idea of "modesty", and by extension, breasts have been associated with very intimate relationships.
So breasts were associated with sex which means that parents don't want their children learning about/seeing sex and try to keep exposed breasts away from them at all costs.