I've read that a person with enough knowledge of anatomy can tell the difference between a "woman" who is a slim man that is very good with makeup and an actual woman.
They usually claim to be able to tell the difference between the two by certain things like digit ratios and pelvic position. Is there any basis to these claims? The one I'm specifically interested in is the "position of the pelvis", as that is the most recent example of the claim I've seen. This is a direct quote from a novel that I'm reading.
EDIT: it looks like I phrased the question badly. As anongoodnurse stated, I'd like to know if there's any basis for telling if a living person is a man or a woman by looking at them.
An example is if you dress up a slim man with a feminine looking face, get a make up artist to make the face look like a very attractive woman, and put that man in a little black dress, would a person knowledgeable about human anatomy, for example a GP MD, OBGYN, mortician, or Sherlock Holmes (kidding), is there any basis for that person to be able to say: "nope, that's a dude".