>>281733472
There's no real name for it. It's just an outfit she dons during one episode where she fights a couple Keronians (and Keroro) as a way to help a mangaka get some ideas for his battle shonen.
https://files.catbox.moe/zt9ipx.png

I wish I had more for ya, a lot of her one off episode outfits don't seem to have refs sheets (or at least ones available to the public)