The Vera Wang "Alizee" is a princess ball gown wedding dress known for its architectural design and use of crepe, tulle, and organza. It features a clean, corset bodice that contrasts with a full, "tumbled" skirt, and is finished with an oversized flower accent. The dress often includes a cathedral-length veil and can be found with a sewn-in pearl beaded belt. 
Here's a more detailed look: 
Silhouette: Princess ball gown
Fabrics: Crepe, tulle, and organza
Bodice: Clean, corset style
Skirt: Full, with a "tumbled" effect