From the Super Mario Wiki
During the events of the game, the dress is stolen by Bowser and the Broodals for Princess Peach to wear in her forced marriage to the Koopa king. After Mario defeats Bowser in the Moon Kingdom, the Lochlady Dress is returned to its rightful place in the Water Plaza. Additionally, one of Mario's costumes is based on the Lochlady dress, which can be unlocked by scanning the Wedding Peach amiibo or by having 460 Power Moons and then buying it at a Crazy Cap store.
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