Diy Lydia Deetz Costume . Lydia deetz is a character from the 80s flick beetlejuice. Here you will find everything you will need to make an accurate cosplay! Baby Beetlejuice and Lydia Deetz Costume DIY Costume Guide from www.costume-works.com Much more authentic than the store bought version, and no pattern required! Lydia deetz likes to wear black, which we find throughout the film as she is always wearing different black outfits. Bettlejuice costume 5 steps instructables.