This is what we think is the 2018 best collection of plus size dress styles that Macy’s has to offer. If you are looking for a formal plus size dress. Macy’s carries some gorgeous frocks that will make you rock. Being on board with the 2018 trends, Macy’s formal dresses come in a variety of cuts and colors. Styles range from froufrou to sleek and sophisticated that can create quite a stir when you enter a room.