Here in the State of Maine there is no law for either sex against being topless in a public area.
Even for males it is not common. Private businesses can have “no shirt, no shoes, no service” bans for entering their establishments.
One day, a few years ago I came out of a drug store to see an organized parade of men and women topless walking down our main downtown street. The news called it a “protest”, but I have no idea what they were protesting about as it is legal.
Being a northern state it is generally not practical to not wear at least a t-shirt as the warm parts of the day are rather fleeting at the best of times.
I still don’t understand what point they were trying to make. A week before they had an open gun “protest” in one of our parks. People carried guns openly. That is not illegal either, so I did not get that point.
I had a thought! What if we brought those two groups together and had a open gun topless parade? That I might go see as not much happens here.
This might not be what the OP was trying to say, but I think it is pertinent at least from the waist up.