Possible Clues:

• As we're perturbed about temperature, producing warm garment
• High jumper?
• Jumper, as it were, is agitated without one
• Labour on retrospective cover-up
• Top choice
• Cardigan, for one
• Cardigan, e.g
• Signature attire for Archie
• Singular set of clothing, including oddly twee pullover
• Mister Rogers' cozy garment