Possible Clues:

• Mr. Rogers trademark
• Start of snow something forecast - Henry gets out jumper
• Jersey or Cornish type of apple
• Promise to imprison the heartless slave-driver
• Garment was entangled with tree
• A present from Mum!
• Cosby often wore one on his show
• Warm garment husband's not needed in Southern climate
• Knit pick?
• Jumper showing signs of exertion