Bodycon dresses are mostly meant for glam occasions, and flats are always more on the casual style. Thus, a bodycon dress with a pair of flats is a complete no-no! Look for pretty heels, preferably stilettos which can give an illusion of a slimmer and taller body. But if you are not very comfortable wearing stilettos, you can always choose some good wedges or platform heels that give better support in comparison to the stilettos.