Pants and Jacket for Jack Skellington costume Women’s medium but appears to run small. Please use approximate measurements to determine fit: Pants: flat lay waist 11 inches, stretches to about 16 inches. Inseam 27 inches Jacket: shoulder to shoulder about 15 inches, pit to pit about 18 inches, waist about 14 1/2 inches. Shoulder to hem in front 24, back 38.