Unpopular girls yearn for the good ol' days, back before they became so unpopular. It was a time of pure potential, when their destiny wasn't yet revealed to include never getting asked to the big Homecoming Dance, or growing up to have more cats overall than lovers.
Unpopular girls embrace this childhood yearning by adopting many aspects of their younger days. They might start dressing like they did in their infancy -- to an unpopular girl, there is nothing cooler than the sundress/white tights/maryjanes combo, except perhaps saddle shoes. They also might start watching television shows (Hey Arnold!, The Secret Life of Alex Mack, Clarissa Explains it All; pretty much anything from Nickelodeon in the 1990s) that they liked in elementary school, or playing board games of which they were fond around then, too.
But often this regression to kid-like tendencies comes in the form of media collection. It has already been established that unpopular girls love VHS tapes, but those tapes get even better when on them are movies intended for children. Children's music (Raffi, Charlotte Diamond, that one CD They Might Be Giants put out), books (Wayside Stories from Wayside School, The Fantastic Mr. Fox), and books-on-tape (Mr. Tickle, Sky Full of Babies) are also frequent contributions to unpopular girls' accumulations of useless (yet nostalgia-inducing!) things that they've purchased at Goodwill.
