The actress is quick to fix the wardrobe malfunction mid-scene, pulling the gown into its original position, but the chest-exposing take wound up in the film's final cut.
The problem with this is that zippers did not exist in 18th century Austria.
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Any skilled costume designer, dedicated director, or eagle-eyed editor would remedy accidental near-nudity or glaring mistakes on set or in post-production to ensure the public never spotted the garment glitch.
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Needless to say, it ended up in the movie anyway.