I agree, don't limit yourself to a designer. I had no idea what was going to look good on me, I'm petite as well so didn't even think I'd be able to pull of a full length gown. I would suggest going in with an open mind, and try on a dress in each silhouette, you'll know immediately what you feel best in. Having a few things you want (mine were white, no satin, sweetheart neckline, and a little bling) will help the ladies at the store pull dresses with features you want. Taking a few pictures of dresses you are drawn to will also help. Good luck, and enjoy the experience!