She wore a black stretch lace dress from her Winter Kate fall 2010 clothing line.
This Winter Kate "Anais" dress is available for pre-order here for AUD$199 or here for $159.

Women Fashion Wear Manufacturers, Suppliers and Exporters - Marketplace for ladies fashion garments,women fashion clothing, ladies fashion wear, women fashion garments, ladies skirts, ladies tops, ladies dresses, ladies tunics, ladies pareos, ladies stoles, ladies shawls, ladies kurta, ladies poncho, ladies fashion jewelry, fashion earrings, fashion necklace, fashion bracelets, fashion handbags, fashion footwear, fashion belts