Credit: Stephen Lovekin/Getty; Courtesy of The Row

Mary-Kate and Ashley Olsen just presented their latest collection for The Row in Paris over the weekend, and we've got the all the looks online for viewing. Their 15-piece Spring 2011 collection is full of effortless, floor-length dresses and perfectly-tailored jackets, a long way from the simple T-shirt the label first started with. As Mary-Kate explains in an exclusive video with, "I think we became perfectionists at such a young age, so for us the fit is so important." Fabric is also key in the twins' collaborative design process. "We look at fabrics. We sort of have an idea of the silhouettes we're feeling separately. We talk about it but also keeping in mind our customer—an educated woman, a woman that understands fit and what they like and what's easy to wear," continues Mary-Kate. And they've nailed it this season.