One thing that is important to realize is that there is no one single prom dress that looks the same on all body types. Prom dresses are a case by case and figure by figure basis. Most girls pick prom dresses that flatter their figure, and short girls, especially, often choose empire waists. They should stay away from full skirts. But if you are short and have your heart set on a full skirt for prom, make sure the top of your dress is tight and fitted.
Here are more tips for short girls.