Designer Derek Lam collaborated with eBay to create a five-piece collection chosen by the online bidding giant's users, and now the line is available for purchase starting today! EBay users voted on their favorite designs each week, and the winning dresses, which range from $175 to $295, were announced in March. But, Lam decided to add one more design to the collection—a tee dress available exclusively through the eBay Fashion iPhone app. The $125 silk poplin style, shown, comes in sizes 0 through 16. "The weightless fluidity and detail makes the tee shirt dress a versatile piece for a modern feminine summer wardrobe," Lam told InStyle exclusively. To pick one up, download the eBay Fashion iPhone app at Apple.com. Check out the rest of the five-piece Derek Lam + eBay collection in the gallery, and shop the looks at DerekLam.ebay.com.