From a distance, the biggest giveaway is the proportion of hips to shoulders (that's why some of us like to wear hip padding). Up close, big hands are a common tell (I love the winter, when I can wear gloves), but others are dependent on the individual. Common problems are height, size/shape of nose, and general bone structure of the face (at least the last can be somewhat mitigated by skillfully applied make-up, and sometimes arm muscles.
