I'm getting married in August on a farm (semi outdoors, semi in a barn). The reception is 6-10pm. I have a simple tulle [modestly poofy] ballgown for the ceremony/cocktail hour. I'm considering a second dress for the reception that will 1) be easier to move around in and 2) be lighter since it's August. What are thoughts on wearing a shorter knee length or tea length dress for the reception? Obviously being on a farm it's not a very formal event. (I put "dressy casual" as the suggested attire on our invites.) I'm torn on the decision.