We tend to assume that paying attention to how we show up is shallow.
Let's flip this for a second.
Vanity is preoccupation with being seen. Stewardship is faithfulness with what you have been given, including the body and the presence God handed you.
One is about applause. The other is about alignment.
Dressing as an act of stewardship is not about looking impressive. It is about your outside finally telling the truth about your inside.