I'm really curious as to where the hell it comes from.

I think it comes from a couple attitudes "this is a free country I'll wear what I want and you can't stop me." Others like me just don't give a rats ass what people think.

I'll agree that this my be taken as a lack of respect to some but I'm not interested in impressing people that only care about how I'm dressed. If they can't see me through my cloths then they're superficial snobs not worthy of my time.

OK, after saying that I'm sure I'd show up to the White House in my best. Mainly so I wouldn't get kicked out.