Lots of dark colors to contrast with a lot of gold accessories/patterns to give off that expensive appearance; as well as the feather coat because it's a 'rare' item to get (hers specifically was made of Staraptor feathers), the pencil skirt was inspired by some kpop outfits I saw once and also to give that sense of 'practicality', she moves around a lot so wearing a long skirt can be annoying after a while.

I'm not sure I based her appearance off another character, since I just took a lot of visual details I liked but the main idea I think is of 'a powerful, rich woman'.