Sorry but that's a bunch of you-know-what Leona. Rare is the woman who doesn't pass the visual cues that tell us she is in fact female. It's the entirety of a woman's presentation that gets her over the hump, so to speak. In our world, it's the entirety of our presentation that Tells the outside world "trans-whatever".
I think the (great) point of this thread is what is the starting point. Not so much the dead giveaway but what can we do to throw off the Muggles at first glance and beyond.