for me its mostly what a lot of you have mentioned too like the license, restroom etc
its not a sign but. one time we went to a restaurant and this was a bit early on. the waiter addressed me as miss. on the way back i was telling my stepdad that i was so amazed and surprised that he thought i was a girl. i said, i look like ->-bleeped-<- how the hell did that happen. he said to me, 'he thought you were a woman, not a beautiful woman'.
i guess sometimes we get to think to look like a woman we have to look like those hot chicks we see here and there or the image we want to be like. but maybe, the standards to looking like a woman may be lower than what we think.
some natural for example, look like men. and my friend told me too joking, "women without makeup, do look like men".
