[update: I don’t know why I read 魔装 as 魔法; I guess I just assumed it was 魔法少女, and didn’t realize that it’s a created word, masou, with a meaning like “dressed as a witch” (from 和装 “dressed Japanese-style” and similar)]

A little something recommended by Amazon: 「これはゾンビですか？」 volume 1, 「はい、魔装少女です」.