Its a magical school uniform that takes some of her blood in exchange for increaed battle ability. the anime revolves around her using the uniform to try and find her fathers killer, then transitions into some other **** . Its called Kill la Kill if you feel like watching it, it's pretty good. Has a fair bit of fan service but not so much that it drowns out the action (in my opinion) It's also pretty comedic
I'd let my autism out and rant about how the nudity isn't sexualized and adds to the experience of the anime, but if you're already decided on that whole thing, I won't be able to change your mind.
I just wanted to let you guys know. Here, after making fun of senketsu, about 4 months later i started watching kill la kill for ***** and giggles.
It doesn't have the tangible conflict of SnK, the thought of Death note, or the art of hellsing ova. But goddamn is it just cool. Especially episode 18, that **** hits you like a missile with great pacing and cool **** happening the entire episode.