Possible Clues:

• Roles, idiomatically
• "Billy Two ___" (1973 Gregory Peck film)
• After a century one talks about them being on top
• Fez, toque, and tam
• Caps
• Stovepipes, e.g.
• Porkpies, e.g.
• Porkpies and pillboxes
• Bean warmers?
• Certain Monopoly tokens