"But aren't you a champion at looking unique in the first place?"

And she means that as a compliment! Maybe she could mean it as an insult if it were said with a different tone, or to a different person.. but this is just something Minako truly does believe about Haruka. Aren't her looks exactly what set her apart? She just dresses however she wants, whenever she wants, gender boundaries be damned. It's super cool.

"I'd be more surprised if you were dressed in something similar to everyone else here, you know."