Another feature to look for in a jacket is a focal point at the waistline, such as a noticeable belt buckle. This draws the eye inward toward the focal point, making your waistline seem smaller.
Contoured seamlines that curve inward at the waistline can also help make a waistline that really isn't there. Like-wise, a chevron pattern draws the eye inward and helps give shape to the figure.
Avoid jackets that are longer than top-of-the-hip length. Also stay away from boxy shapes, such as Chanel-type cardigan styles, because they simply repeat the rectangle shape that you want to look curvier.
In the example above, the MICHAEL Michael Kors white jacket (Buy Direct) from Macy's has a flattering V-neckline, which makes petites look taller, a self-belt to define the waistline, and a belt buckle that draws the eye inward to further define the waist. The pockets are balanced above and below the waistline, so they make the figure appear neither top-heavy nor bottom-heavy.