That is false. House elves could not be given clothes. Even to wash or they would be set free!
In 1992, Hermione Granger sneaked three Slytherin robes from the laundry, for Harry Potter and Ronald Weasley to wear while disguised as Gregory Goyle and Vincent Crabbe in order to sneak undetected into the Slytherin Dungeon.
- Harry Potter and the Chamber of Secrets (film) (Mentioned in deleted scene)
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