I'm still in a suit job in a trade that's conservative enough that as recently as 5 years ago I was not permitted to wear anything but a solid white, point collar shirt every day, and had to wear black lace-up leather soled shoes...a light blue shirt, slip on shoes or heaven forbid shoes that weren't black, would get someone sent home to change.
One piece of jewelry on each hand, no big gaudy watches, no gaudy belt buckles, belt had to be black as well, suit could be solid charcoal, navy or black, blue & gold company tie M-W-F, gold & blue ties on other days unless you were driving a coach or limousine, then the chauffeurs wore silver ties, and professional pallbearers wore black and silver ties.
Things are a smidge looser today...but not much.