Not to mention before that with women wearing pants as the rebellion, suffragists and others - that was a rebellion against gender. You might say those were different as "not really a part of gender" but the past would vehemently disagree with you.
Look at photographs of secretly female soldiers - to the modern eye it is obvious enough to serve as documentation but then her comrades didn't know until after injury or death because they expected women in skirts and dresses not uniforms.
