This has been the law for awhile actually, but was not really enforced in favor of women. http://www.policymic.com/articles/42359/topless-women-in-public-not-breaking-the-law-says-nypd
It’s also legal to be topless in the state of Maine.
Legal to be Topless in New York City
by emily | Jun 1, 2013 | Positive Sexuality Blog