After the fake-Supergirl completes her transformation into Bizarro, the S-shield on her uniform reverses. While this is in keeping with Bizarro's comic book appearance, it isn't explained how her physical transformation would affect her clothes. See more
It's like Invasion of the Body Snatchers. That thing in Ms. Grant's office looks like Ms. Grant. She sounds like Ms. Grant, but... but she's being nice to me in a way Ms. Grant never would.
Well, just enjoy it while it lasts.
Yeah, I try, but it's hard to enjoy anything while there's a body double of me flying around the city, making me look bad.