Most Helpful Guy
The key to choosing the best prom dress (or any dress really) starts with evaluating what looks best on your body.
You mentioned you're short. How much do you weigh? What's your bra size, your waist measurement and your hip measurement?
How does the length of your body divide up between torso and legs?
What is your best body feature that you'd like to highlight? (Breasts, legs, waist, butt)
What, if anything, would you like to hide?
What color(s) work best for your complexion?
The answers to these questions will inform what you should look for in a dress.