In Goblet of Fire, Ron is appalled when Molly sends him his dress robes for the Yule Ball. Apparently, they smelled like Ron's Great Aunt Tessie and looked like they sashayed right off The Love Boat.
harry potter - Did any of the Weasley kids get new dress robes for the Yule Ball? - Science Fiction & Fantasy Stack Exchange
LEGO Harry Potter The Magical Guide to the Wizarding World: DK: 9781465487667: : Books
LEGO Harry Potter The Magical Guide to the Wizarding World: DK: 9781465487667: : Books
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Did girls at the Yule Ball wear robes, or did they wear dresses like in the movie? - Quora
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Enchanted - PrincessWinter - Harry Potter - J. K. Rowling [Archive of Our Own]
Everything you need to know about the Yule Ball