It's likely not a true story. Most often, such titles are part of fictional literature where the plot and characters are created by the author's imagination rather than real-life occurrences.
A perfect story wardrobe would have a wide variety of outfits that suit different characters and settings. It would also have unique and memorable pieces that add depth to the story.
The 'Secret Wardrobe of the Duchess Novel' could revolve around the idea of the duchess's private space, the wardrobe. This could symbolize her inner self that she keeps hidden from the public eye. It might explore themes such as identity, as the things in the wardrobe may be representative of different facets of who she is. It could also be a story about discovery, as other characters might find the wardrobe and learn about the duchess in a new way.
This novel is classified as a fantasy adventure. It weaves a tale of imagination where ordinary children enter a extraordinary realm and face challenges and wonders.