Underneath the suit jacket, wear a tailored blouse in a color or small print that coordinates nicely with your suit. A fine gauge, good quality shell (sleeveless) or sleeved knit top, not bulky; not thin or gauzy; not a t-shirt) is also appropriate underneath your suit jacket. Don't show cleavage. (Remember that tv/movies are trying to attract viewers; they don't represent reality of the professional environment.