The contestants are asked to design a "Garden Party" dress. The morning of the challenge Tim Gunn takes them on a field trip to Manhattan's Flower District where they discover they must construct their garments using plants and flowers. They are given an hour to shop and then return to the workroom to begin the painstaking work of making their dresses. Racing against the clock, the designers create an array of stunning work, making it a difficult decision for the judges on the runway. Still, one designer comes out on top and one is sent home, but just barely.

The designers must create a red carpet dress that represents the collection they plan to show at Olympus Fashion Week. With 4 designers left and only 3 spots open for Fashion Week, the competition is fierce. It becomes even fiercer when the designers discover that fashion icon Iman will be the Guest Judge and has agreed to wear the winning dress to a red carpet event. On the runway, each designer makes their final case about why they should move on to Olympus Fashion Week. But in the end, there's only room for 3 and one of them must go home.