Cassandra is wearing Wine & Gold Bikini Top http://dennisdennis.net/store/Loungerie-Triangle-Bikini-Top/c4_16/p143/Triangle-Bikini-Top-Wine-&-Gold/product_info.html

and Silver Fullback Bikini bottom http://dennisdennis.net/store/Loungerie-Fullback-Bikini/c4_19/p154/Lounge-Fullback-Bikini-Metallic-Silver/Silver-Elastic/product_info.html