Laws is Laws. If you had a legal gender change in the jurisdiction you are in then legally you are that gender. So, if it is against the law for a female to go topless, well honey you gave up that bit of "male privilege" when you got your gender changed. Of course, the legal waters get muddied if say you live in a state where you can have your driver's license gender marker changed yet your birth certificate has not, or can not be. A good lawyer billing at $350/hr can help you beat the $50 ticket while setting legal precedent.
Also, in light of the recent North Carolina news cycle say me, a male with a B cup not legally in any way a female. Say I go out in full female made in a low cut top to show off the girls. And walk into the Gent's..... Or a muscle bound Trans-man with a full beard walks in to Ladie's?