I think if you dressed a load of people of similar build with neutral hairstyles, it'd be very hard to tell them apart. It's make up and hair and clothing that really helps us make the decision, but as has already been said, sometimes, it's not that easy!
14/16. funniest thing I saw a while ago on utube, was a couple of chavs being knocked out by 2 cage fighters in drag.
Bill Kraulitz. Kim Petras. Alexis. Three people proving that it is not possible - Nor safe - To assume gender by face alone!