There's definitely a lot of developers who won't work at places with business-style dress code (suits, no jeans, etc.) in the financial industry.

I agree, what I mean to suggest is that the developer of this software was not necessarily wrong to mark those as hollow because there is a (probably) larger amount of developers who don't mind business-style, hence the suggestion for an option to enable/disable.

I'd prefer the suit, but note that referring to the toggle as "professionalism" is going to go right up the nose of the ping-pong players.