Related Clues:

• Knightly wear
• Word unit: Abbr.
• A, B, or C: abbr.
• Cardboard pkg.
• USPS unit
• UPS unit
• Knights' garb
• 'You've Got --'
• Serious dating, in personal ads
• Send, as a postcard
• Env. filler
• USPS piece
• Envelope enclosure: Abbr.
• A secy might take one from a CEO
• A, B and C: Abbr.