I'm pretty sure the transition of "tech fashion" from something early computer nerds did at least somewhat authentically to its modern form was, at first, an example of exactly that (by people who "don't care about their appearance", naturally, wink wink). Of course these days there's a bunch of other stuff it's mixed with, like hipster fashion and outdoor-lifestyle-but-only-the-expensive-stuff clothing, but originally it seems to me to have grown out of exactly that aping-authentic-countersignaling thing.