That the girl in leather is Devon Carlson, who’s phone case company is Wildflower Cases ? Or less that the lyrics are to be taken literally, but rather that the girl in leather is Billie, herself. A full-on art song. That the other two are stage characters, including the singer. THE DINER has Billie in character as a stalker.
https://www.reddit.com/r/billieeilish/comments/1ctr07x/wildflower/