Would this be indecent exposure (see details)?

If a woman has had a double mastectomy, and chooses to go topless in her yard while gardening on a hot summer day can she be arrested for indecent exposure? Is the law about breasts or women in general? What about in the park playing frisbee with some friends (as men often do)? At the beach? Thoughts about this (including legal knowledge if you have it) please…