As a crossdresser, I am also sometimes clocked by girls. After trial and erros, I have learned how to present myself well as a woman. Keep in mind that presenting yourself as an opposite gender requires practice and trial and errors.
Some of my stories. I sometimes share women's rest rooom with other women who knows very well that I am a biological man. They just accept it after making some jokes.
I tended to wear very bold and unfashionable clothes, but later I learned a little bit how to wear properly as a woman. In my country, people can clock me by my height alone as women:

Nevertheless, people do not care so much about me in big cities where there are many tall young women. Still, I look very striking, attracting people attention around the world. I do not think my height is the major factor. For example, in Russia last week, in Poland a few weeks ago, and in Germany several months ago, people still looked at me while I ran outdoors, although there were a bunch of tall women in the street.
When I shop, I have no alternative but to talk with sales women, revealing my manly voice. Still, those ladies are very kind, and their last comment is like "wearing it prettily".
And, finally my photo at Nashville that an old woman in the street there took for me:

Of course, some drivers in the car there also paid attention to me.
Barbie~~