Possible Clues:

• Headgear that's out-of-date
• As outdated as the fez
• Ancient porkpie, for example, past its sell-by date
• Tile - and what it's use in crossword clues is!
• No longer fashionable or novel, like used headgear
• Shabby cover for novel? No
• Starts off cold, that is the opposite of hot
• Dated a deerstalker perhaps
• Top Gear is a bit pass�
• Outmoded beret that should be thrown out?