Yeah, both Zendaya's costume and C3PO (and many other robots in sci-fi) have the Metropolis aesthetic.

Just that Star Wars being as popular as it is means C3PO is iconic on his own, and no one thinks a lot about why the stylistic choices were made when they designed the C3PO costume in the 70s.

It was exactly a metropolis inspired look. She got it out of a museum basically. It was on the runway in the 90s(?) as an homage to the robot woman from Metropolis.