I feel like it doesn't serve us any more and the younger generation is getting lost in the toxic sauce and we've just become the same as the suits but with way less professionalism but that's probably a romanticized notion of what corporacy is based on my own experiences running early software from Apple when it still kind of was a shirt and tie corporacy (before the black turtleneck became the standard)
Anyway, you'll probably defend your right to wear a t-shirt to the death while claiming 'what you wear doesn't matter' so ask yourself whether what you wear actually does matter?