Related Clues:

• "Put a ___ on it!"
• Teapot cover
• It may be checked
• It goes over your head
• It may be passed or cocked
• Head liner?
• Word with box or trick
• Bowler, e.g.
• Jar part
• Bowler
• Head cover
• Panama, for one
• Bowler or porkpie
• Rabbit's hideaway?
• It participates in cover-ups