Well... if you think of one of those English country manor sort of libraries with the dark wood panelling and the bookshelves up to the ceiling, quite well, actually. However, for the more contemporary library, the miniskirt, hair in a bun, glasses, and the demure yet enticing blouse (or well-fitting sweater) work much better. Either that, or the all-in-black ninja librarian look...

YMMV, of course.
*g*