Disney Nightmare Before Christmas Jack Skellington Pajama Set Size 10. Disney The Nightmare Before Christmas 2-piece pajama set, size 10: navy long-sleeve Eerie & Haunting Jack graphic top with patterned sleeves, gray Scary Christmas Jack print pants, flame resistant, 100% polyester. Defects: Small white mark/stain on lower front of navy top (6087); fleece pants show pilling. Please see all photos for exact condition. 30-day returns, buyer pays return shipping.