Body shapers are a good choice for just about any body type. Plus-sized women can benefit from the smooth, streamlined effect of a full-body shaper. It's important to note that your shaper should not be so tight that it leaves marks or makes you uncomfortable. The purpose isn't to suck you in too far, but to make your curves smooth under your clothing.
This is particularly poignant for dresses and outfits that hug your figure. Take advantage of stores that allow you to try on a body shaper before you purchase it. Sometimes, you need to purchase a shaper that is one size larger or smaller, depending on the manufacturer. Also, keep in mind that most body shapers have built in bras, so you should find a size that fits your bust as well.