E.g.: I'm a jeans & t-shirt kinda guy. However, I now dress a little more formally (business casual) because it leads to better outcomes. I've not gotten around to wearing suits even though that would be even better.
A little more strategic: I usually wear at least one item of clothing with my employer's logo visible on it. (Gives off a "corporate citizen" vibe.) A far cry from the recent past when I'd carry a laptop-bag with my ex-employer's (and a competitor of my current employer's) logo on it.
I found Scott Adams' recent books and Daniel Kahneman's work profoundly influential in changing my "observed personality" (i.e. the psychology I project to the world), and making me an order of magnitude more effective in dealing with work issues/co-workers.
Please share a few books (or perhaps authors/youtubers) that you learned from. Thank you.