I think for chef dinners, etc. a jacket and tie is suitable. Really, when any other uniformed professional has an event, they would generally attend in formal attire. CC, I also understand that elevating the rank to being recognized as professional is extremely important. I am just not sure if it is a 'formal enough' look. Like, when a member of the military would attend a wedding or funeral, their formal attire is recognized and appropriate. I consider other artisans professionals (wood workers, for instance) but the general expectation is they attend a formal affair in jacket & tie. Is the same true for a chef? I am not disagreeing with you, just asking.