The most obvious choice is to wear a cocktail length dress. These are not as fancy or formal as an evening gown, but still allow you to show off your personal style. These cocktail length dresses can be fit and flare styles, shirt dresses, or sheath dresses. Flowing maxi dresses are also a great choice, especially if the rehearsal dinner is earlier in the evening and during the warmer months. And lastly, a blazer suit is always an elegant choice if you want to wear something other than a dress, but still be fashion-forward!