I laugh in the face of fashion. Plain black t-shirt, non-scruffy black jeans,
Sounds like a guy I worked with until a couple of years ago. Even customers were directed to "look for the guy dressed like a roadie for Metallica".
One of the smartest guys I knew, and no-one (customers included) cared a fig for how he dressed.
Me? Jeans and Eddie Bauer shirts. I'm a conformist.