Do your best to ignore them as everyone has said. Remember that a lot of the time, its all in your head with what you think people will see you as. My biggest concern out in a skirt and then dress wasn't if I could pass or not (Had plenty of those times though) but whether people would see something sticking out or not because, I haven't ever tapped (Or whatever it's called) before so it was quite nerve racking and also I had to do something to keep it from showing which wasn't too pleasant but I had a lot of fun still. Also, least you have someone, a friend in this case who would call you a she and mean it and defended and stuck up for you. lol Many of us don't have such a friend let alone anyone. lol So don't worry about it too much.