Diy Where The Wild Things Are Costume . This is a homemade where the wild things are couple costume. I love the idea of sibling costumes, and lauren loves the. DIY Where the Wild Things Are Max Costume from www.schoolofdecorating.com The finished piece was about 6 inches high and 13 inches wide. I started 2 weeks before halloween, for me that is crazy planning ahead. Sew them together to make two pockets and sew them to the ends of the sleeves on one side.