's amazing fanfic Harry Potter and the Methods of Rationality which you should check out if you haven't yet:[link]
Anyway this is for chapt. 72
The appearance of Lavender in the outfit of the Soldier of Gryffindor from the Chronicle of the Lunarian Soldiers (a.k.a Sailor Moon to us muggles)
No doubt someone's done a better version. The outfit is a bit of guesswork & I'm really not happy with the anatomy...but I think it turned out ok overall.