I think it's less 'intentionally dress down' and more just a logical consequence of caring more about abstract and technical problems than impressing people. I

I think it's less 'intentionally dress down' and more just a logical consequence of caring more about abstract and technical problems than impressing people. It's not as if they refuse to care about worldly things like clothes or cars, they simply don't because there are other things they care about more. I can see it in myself based on my environment and current goals.