Halloween Birthday Dress From a Duvet Cover

A dress to wear for my birthday and Halloween party, and also maybe to the office if I finish it in time. This will be my first garment project for a while as I lost my dressmaking mojo after a few expensive and time consuming fails. I'm using a duvet cover - wish me luck! https://www.dunelm.com/product/furn-bootanical-forest-polycotton-duvet-cover-pillowcase-set-1000295661?beddingSize=Super%20Kingsize&colour=Multicoloured