Scientific research (Adam Galinsky and Hajo Adam, of Northwestern University in the US) has shown that the psychology of clothed cognition shows that clothing not only impresses others, but that what you wear has a major effect on one's own self. behavior and well-being. Clothing can offer an enormous support to make your qualities visible and to gain self-confidence, to feel safe and secure, to help you, comfort you, play etc.
Clothing also functions as language for those who cannot express themselves verbally, for example. Clothing gives off a signal, it has a communicative property which can lead to a conversation and to be seen (or not).