Wearing a basic white blouse under a sweater with a pearl necklace is a classic look that never seems to go out of style. A sweater that would otherwise look a bit casual, gets a whole new professional image when you put a white business blouse under it. Some blouse collars lay flat and some stick up. In this case the stick up collar adds a more confident feel to the ensemble. Pull the blouse collar up and over the sweater, and shape it so that it sticks up slightly. Adding a white suit blouse to a sweater gives it a slightly more business-like flair. (This ensemble from Talbots.)