Going to a formal event can be nerve-wracking. Aside from looking for a dress (which there could be too many or too little choices of), you'd also want to look good in the said dress. I mean, formal events come only so often for people who don't work in the PR or event organizing circuit so it'd be terrible if you messed up that once in a lifetime chance. As a fashion enthusiast, I guess the easiest and best tip I could give you to look good in whatever you wear is to dress according to your body type.