Another favourite: Daddy Long Legs by Jean Webster. This links to the gutenberg etext which can be read online.
Did every reader fall in love with it like I did? Could they all relate to it like I did, years after I first read it, when I went to college? I lived alone, and experimented with all sorts of lifestyles and clothes and economies, and indulged in a variety of messes imply because I'd never even known such people/places/things existed. Just like Judy.
I hated the movie though. Silly Fred Astaire.