Whoa, didn't know if made it onto US coinage that way; I mean I tried to pay attention to the important stuff in class, but... 
So much for the Victorian/Edwardian were a bunch of mal-adjusted prudes line liberal thinking.
From the same link:
On January 17 of 1917, the bare-breasted Standing Liberty Quarter finally entered circulation, and the outcry was immediate and loud. Religious leaders used words like "obscene" and "filthy" to describe the visage of our beautiful Miss Liberty with her breast exposed. Citizens' groups rallied their memberships to lobby Congress to have the disgusting coin recalled.
Congress had little choice but to submit to the clamor. The bare-breasted Liberty Quarters began disappearing from circulation.
McNeil was obliged to modify his design. Miss Liberty would need to be properly covered, according to the citizens of our enlightened nation. It is easy to imagine that McNeil might have been a little resentful about the modification chore he had to undertake. Rather than simply rearrange the drapery on Liberty's shoulder to cover the offending breast, he crafted a suit of armor instead, and chastely clothed Miss Liberty nearly to the neck in chain mail!
