This isn't female!Jotaro
Its just him -- in a female uniform

Cause
I am cursed

DIALOGUE:

Kakyoin: I can't believe you went through with it!

Jotaro: I'm not a coward and took my punishment in stride.

Kakyoin: Looks good on you, JoJo.

Jotaro: Shut the fuck up, Kakyoin.

CLOSE - UPS

He wants to die

That uniform may not stay on for very long--
*slapped*