Hard to say for sure. It could be a blend of truth and imagination. Maybe some aspects are true, while others are made up to make the story more engaging.
Well, Mr Bates vs The Post Office is typically not based on real events. It might draw inspiration from various sources but is mainly a product of imagination and creative writing.
Hard to say. It could be associated with a minor character whose background wasn't fully explored. Or perhaps it was just a random prop without a specific owner.
I recommend One Piece: The Great God Usopp to you. This book is a story about Usopp. It tells the story of how he obtained the League of Legends system through an accidental transmigration and became invincible. If you want to read a One Piece Doujinshi novel with a deceptive cloth as the main character, this book is perfect for you. I hope you will like my recommendation.