Related Clues:

• Knight's cover
• Drop in a letter box
• Name on some hot dog packages
• Postal deliveries
• Letters and such
• Defensive armor
• Drop in a letterbox
• Letters, collectively
• Chain mail and such
• Drop in a slot
• Clunky attire
• It's not delivered on Sundays
• Knight's apparel
• Postal sackful
• Attire for Galahad