There are several costumes in Star Wars that require fur, faux fur specifically; the most notable are the Ewoks. Less noticeable is Queen Amidala’s Red Invasion gown from [The Phantom Menace], as well as the cape that goes with Amidala’s Senate Address gown from the same movie.
Moire fabric is likely the kind of fabric used in the body of the gown of Padmè’s deleted scene senatorial gown from (Attack of the Clones). Moire fabric is sometimes called watered silk and historically Moire was made into silk taffeta and now is made into other, sometimes synthetic, fabrics. For Padmè’s senatorial gown it’s likely to assume that it is made out of Moire silk taffeta, in gold.
Jo-anna’s Fabric’s has a cotton/polyester blend available online; the fabric can be purchased at other sites online as well. (Note: that cotton/polly will be hard to dye gold, an all natural fiber, or a synthetic in gold, would work best.)
One of the common myths about hairstyles in the Star Wars universe is that these intricate styles are achieved with a person’s own natural (often times long and thick) hair. In reality a combination of wigs, hair pieces and hair extensions, among other techniques, where used to give the length and volume needed for these styles. Princess Leia’s and Queen Amidala/Padmè’s hairstyles are commonly attributed to this myth. However, both Leia’s and Padmè’s hair is achieved through the for mentioned hair help. Within universe the characters achieve these hairstyles with wigs, hair filler and forms among means other than their own natural hair. In [Star Wars: The Clone Wars, Season: 3 Episode: 11, Pursuit of Peace,] a short scene near the end of the episode shows Padmè talking with her handmaiden Teckla Minnau. In the scene Teckla is holding Padmè’s senatorial wig/headdress which Padmè wears with her (blue and gold) senate dress from the Clone Wars TV show.
A behind the scene photo of Padmè’s [Star Wars: ThePhantom Menace] (black Coruscant) wig/headdress from [Padawan’s Guide] shows that the wearers real hair is tucked beneath the wig/headdress.