Personally, any style that hides this body's imperfections and at the same time is easy to wear hits the top of my list every time.
The crossover vest or pullover is just that, the fact that it can be stocking stitch simple or more textured as illustrated in the aran styles.
Short or long, you can layer this garment with a pretty cami whether it's the traditional slip version or a long sleeved style in the sheerest or laciest of fabrics.
Basically the fronts of this style are two rectangles that cross over and are sewn to the sides of the back either closer to the underarm or down nearer to the waist.
Try two different textures for each front or one side striped and the other side in a solid or marl.
Lifestyle lookbooks featured on retail sites such as Anthropologie try to tempt you with their new merchandise. These are definitely a good starting place for inspiration in styling, color and texture combinations.
Read further for different approaches to the crossover style and see schematics showing the basic construction.