Jean-Paul Cauvin calls himself the binôme, or right-hand man, of the French designer Julien Fournié. Fournié and Cauvin recently teamed up with Dassault Systèmes, whose 3-D simulations last year demonstrated how you could tug an iceberg across the ocean. Why this unlikely partnership? Together, the team developed FashionLab, which enables fashion designers to envision their garments in 3-D from the earliest stages of the creative process. As New York Fashion Week drew to a close, Fast Company spoke with Cauvin about the need for designers to embrace the brave new world of technology-assisted fashion design.