For a long time the stereotypical “young professional” look was tied closely to just a few mainstream retailers (Banana Republic for example), but over the last ~15 years a wider range of smaller or more specialized brands has entered the space: Alex Mill, Spier and Mackay, etc.
But even ignoring that your analogy doesn’t quite fit since price plays a significant role in clothing purchasing decisions: Fast fashion succeeds largely because it is cheap.
If reasonably priced, higher-quality alternatives were accessible people would buy them. It’s partly why certain brands have grown in popularity (Carhartt, for example).
N of 1, obviously, but this isn’t as outlandish as you wanted to make it seem here.