Is being called an EMO visible more in your appearance or in your behavior?

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I have seen many times and talk to self confess EMO or fans of EMO bands, styles, groups and represents by majority of young people following latest trends and fads. I think that I could be EMO when I feel easily hurt and depress due to events that makes me sad. Such, as the loss of loved ones, break-up, sickness, seeing others people suffers terrible death, sickness, wars, orphan children and loss of battles and lives unmeaningful. But, I observe that many youngsters declared being EMO and they carry it to the way they talk, dress or deals with people. Some wears all blacks clothes, amulets, make-up with heavy black eyeliner and a huge fan of EMO band. Do you agree that to be called EMO, must be reflected on outer appearance or we could be called EMO, even we kept the feelings inside ourselves?