If your base outfit is monochrome or features solid colors, choose a bolder third piece to accent. For instance, liven up a black top and pants with a brightly colored or patterned cardigan or sweater. Add a casual flannel button down over a t-shirt and jeans to pull the outfit together and make it more interesting. If you’ve chosen a boldly striped top, try a sharp solid colored blazer over it. A blouse or a top with ruffles, embellishment, or buttons may be more appropriate for a formal occasion.