"Tuxedos started back in the 1800s because the military always had full-dress uniforms for parties and formal occasions. The laymen didn't quite fit into the into the look. So, tuxedos started as a type of uniform for special parties and royal events in England. Everyone dressed for these parties, and the tuxedo came along as the formal way to dress for the person who was not in the military or part of the government."
http://www.bscenemag.com/b-wed/tuxedo-tradition
Tux has only been a tradition for what 200yrs? More of a keeping with appearances than anything to do with sentiment or symbolism. Wear the suit. You don't "have" to have a tux.