“The dress is considered the most luxurious garment that Lake Lamode has to offer and it's a national treasure. It's said that wearing this dress brings eternal happiness. Unfortunately, this special one-of-a-kind dress is not for sale.”
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 display window on the second floor of 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.
Starting from the Peach Tour, a variant of Peach in the Lochlady Dress, referred to as Peach (Wedding), appears as a playable driver in Mario Kart Tour.