Ok so my fiancé and I are taking our engagement pictures next weekend and I still don't have…

Ok so my fiancé and I are taking our engagement pictures next weekend and I still don't have anything to wear. I really want to find a pretty dress to go with my brown cowboy boots but I just feel fat in everything because I'm so bloated. :( Anyone have any suggestions of places to find cute dresses that aren't expensive? That look kind of vintage or like lacey.