I think there is some virtue in the notions of fashion being this "mix" and "match" approach that the kids wear these days, it tends to break the constraints of political correctness that the fashion industry would like to impose for commercial reasons. Where the general society is willing to recognize people who are not simply conforming to a current fashion, it allows for a far wider range of garments to be economically viable.
Something that stuck in my mind was a dress a lady friend of mine showed me, a Japanese design based on circles that she paid some outrageous amount for and when I had a look at it, it looked like it had been cut out with a knife and fork, unsecured edges and poor quality stitching. This is typical of at least some designer labels, you pay for the label and the so called design and try not to notice how poorly they are made because you are expected to buy next year's season.
Particularly for the ladies, you still see fashion parades with size 6 scarecrows wearing things that most would not wear to their own funeral where the vast majority of women are in the size 12 to 14 range yet are not always well catered for and big girls have terrible problems trying to get decent clothing. The girlfriend of one of my old friends years ago was a classic example of a person who just could not buy cloths that fitted from normal sources. Back then the fashion was "Twiggy" style clothing for girls and this particular lady was a curvy, busty tall girl of about size 14. Her approach was to continually raid the second hand clothing markets to get what is now called "retro" clothing and she always looked elegant and well dressed.
Diversity is a winner for both wearers and clever manufacturers in that it breaks the grip of a corporate level clothing manufacturing industry. While large manufacturers have all the advantages of economy of scale, cheap labour, distribution networks and an industrial supply chain, they cannot compete with the flexibility of a smaller custom manufacturer that can make different garments on a daily basis.