It’s a way of looking. Just like other’s use it as a way of looking at others, we use fashion as a way of looking at ourselves. It means we are interested in a way how we are being perceived from the inside of the outside of our perception. It does not really matter what the outside really think of how we look, because we will never know this for sure, we are more importantly interested in the way we think others look at us.
In another way, Fashion can be seen as an interest in a rhythm of proportion. Some people who buy into fashion through looking at trend are not aware or not that interested in the rhythm of their own proportion. They are as I said above, more interested in satisfying their own perceptions of their public (especially in the world of social media). I posit that everyone considers themselves having a public if they consider themselves interested in fashion. Even if in fact, nobody is really that bothered with how you look because they’re more preoccupied with the way their own perception of their public think of them.
So what I mean with the rhythm of proportion is that I am imagining a 'me' walking my body in a private knowledge that satisfy a particular rhythm at that particular moment, a set of combination of everything I put on (clothing and such) or in me (in the case of body modifications) that is harmonious only to my mind, a cacophony of the way my walk, my body language, my mood and my movement is to my own sense of belief.
If you consider yoga as a union of your breath and your movements, style is a union of your gestures and your clothing. Sometimes this union is a rhyme, a poetry of shapes and colour that simultaneously add to the gestures when I wear it, other times it’s a union of interruptive beats of colours that sets my body into it’s (ideal) proportional groove. Ideal is when the proportional groove matches the emotion I am feeling at the given moment.