Okay, so... In this universe timeline her brother attended that school. And he spilt olive oil all over that pants... (more so drenched it in accidental 'I didn't know' clening methods. Probably too poor for maids to help.) Anyway, so he stained them and then Hibama used them.

He's got hair on the back of his neck, which he can easily shoot into ribbons.
Still pink... maybe even bright

She incorporates fire into her quirk somehow. Like passion... zeal?
That univ Feriya is also a girl though...