I've seen a lot of posts about Palpatine's red sith robe but what about his main prequel skin that he had in both the clone wars and revenge of the Sith :
Star Wars: The Poli-Sci Jedi: Images of Power Part I: The Empire (and Palpatine's wardrobe)
3D printing file : Emperor Palpatine's brooch – juliechantal
Emperor Palpatine Cosplay Inspiration
Show-Off: RotJ Emperor Palpatine Robe | RPF Costume and Prop Maker Community
Emperor Palpatine Full Mask - Star Wars - Spirithalloween.com