Related Clues:

• British mail
• It's sometimes certified
• Joust wear
• Garb for Galahad
• Breastplate, e.g.
• Jouster's covering
• Junk in the box?
• Combat covering
• Jouster's wear
• Kind of bag or box
• Hard-to-break plates
• Tilting outfit
• Sword stopper, maybe
• Snail ___
• It may contain a lot of letters