Glinda (formerly Galinda) is one of the main characters in the musical Wicked, which tells the backstory of Elphaba, better known as the Wicked Witch of the West in The Wizard of Oz.  Glinda begins her journey at Shiz University, where she is accidentally assigned as Elphaba's roommate.  Despite the rocky start to their relationship, the two eventually become friends, though not every fairy tale in this case gets a happy ending.  While there are certainly more well-known costumes for Glinda in other media, the costume she wears when she arrives at Shiz is a classic white outfit with nods to vintage styles including oxford pumps and a white beret.

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