In the state where I live it is technically absolutely legal for any one of any gender to go topless. That said, try it in our capital city and the police will swarm you on any day thats not the Gay Pride parade (I mean that, from personal experience), many municipalities have laws on the books that specifically define that "female" breasts must be covered. Some municipalities say the nipples, but others say mid breast and bottom of the breasts, while others say nipples and mid breast/bottom breast. I don't think any of them have caught up to the idea of trans people, and almost not have defined female specifically enough to account for non-binary people as a whole.
To be honest, I wouldn't even know which would trump - state or municipality.
Then there is the whole other issue of safety. We have nudist colonies I would fee extremely safe in - for cis binary or "passing" trans binary/nonbinary presentations. And then there are so many places where its just unsafe to be non-binary, trans, genderqueer, gender fluid.
I can see so much joy in the thought of a little piece of freedom in your query I almost hate to bring up the dangers.
I suppose can you go topless really depends a lot of geography, safety, risk factor and risk tolerance.
