The dress is made with "ivory and white satin gazar. The skirt echoes an opening flower, with white satin gazar arches and pleats. The ivory satin bodice, which is narrowed at the waist and padded at the hips, draws on the Victorian tradition of corsetry and is a hallmark of Alexander McQueen's designs. The veil is made of layers of soft, ivory silk tulle with a trim of hand-embroidered flowers, which was embroidered by the Royal School of Needlework. Quoted from Official Royal wedding website.
Check out this video, show Kate Middleton on her beautiful wedding dress.