If GP were heavily dependent on his/her job and in an environment where wearing suits is required, whether he/she likes suits would be completely irrelevant. Only because he/she apparently has a certain amount of power in their job (for example due to a sought-after skill like being a programmer) can this norm be overturned.

Over the decades, a suit has morphed from "I have power" to "I conform to the norm (and therefore I don't have power)" and with that change it is also apparent why people would want to not wear suits in an environment that traditionally required them.