You don't need to suffer breast envy anymore: A sweater in the right style will give you the bust you've always dreamed of -- or at least the appearance of it. Turtlenecks are elegant and flattering on flat-chested women. Look for styles with details that cover the chest area, creating curves. Chunky knits are good at giving the illusion of a larger bustline, as are fitted long-sleeve sweaters. For a sexy look, try a halter-style sweater. It will show off your shoulders and arms while accentuating the bustline.