EXCLUSIVE AT NET-A-PORTER.COM. Kaftan dresses are one of Oscar de la Renta's signature silhouettes, and this one is such an elegant choice for springtime functions. Made from featherweight silk-twill decorated with a botanical print, it ties at the waist to accentuate your frame. The draped front falls fluidly into a maxi-length skirt with a slit that hits just above the knee.