On the contrary. I’ve encountered people at all levels of seniority who have no idea how to dress for all kinds of work events.
The people who wear a cropped top on a dress down day, for example, or a T shirt with an offensive slogan. Either through ignorance or because they think that it’s an occasion to show off how individual and unique they are, not like all those fuddy duddies who need educating, yes, let’s smash the system. It seldom works out well. That’s why I suggested saving the quirky style statements for your private life.
People will judge you on the basis of your appearance, whether we like it or not. They will form a view on aspects of your character based on how you present yourself. Is it fair? Maybe not. Does it happen? Definitely.
Another example would be, in an organisation where formal business wear is only needed occasionally, a man who keeps hoiking out the same suit from 25 years ago, even when styles and cuts have changed, will be seen as out of touch, and not just with fashion.
In response to your second point, you don’t have to be senior to meet clients or lead projects. Projects come in all sizes. You may have decided that the role you are in is more junior than you could manage under other circumstances, but that doesn’t mean that you have to become the office kook whom people have decided is a bit unpredictable and whimsical and can’t be trusted with more interesting work.