Both of my children wanted to go as Michael Jackson from Thriller - one as the werewolf, and the other as the zombie. Thriller costume jackets are expensive, and hard to find in children's sizes. So I decided to make my own homemade Thriller costumes.
I found red vinyl rain jackets on clearance, cut the hoods off, and used black quilt trim for the detail. Then I found girl's red leggings and shortened them so their socks showed. Last, I bought a standard wolf mask at a Halloween store, and used green face paint and black eyeshadow for the zombie.
They won first place in our family costume contest ;)