Though the most important thing that people need for their physical is to be healthy, there is other thing that they need. What is it? It is called as beauty.
As we know, besides being an individual being, human is also a social being that needs relationship with other people. By this, language is the requirement to communicate all things. If you think that communication can only transferred from what you said from the spoken language, you will need to consider how you appear will give a certain reaction to other people.
Being beautiful does not mean that you have to be like that beauty pageant queen with her dressing gown, crown, and the never ending smile in TV shows, being beautiful is when you can meet the occasion where you are at with how you express yourself with what you say, how you respond things, how you make gesture, and how you appear.
Dressing in black boots, black trousers, and black t-shirt does not necessarily consider as mysterious, gloomy, sad, and ugly when you are in a punk music concert. It can be beautiful. So, beauty will depend on the occasion where you are at. In other words, it depends on the context of when and where you appear.