Possible Clues:

• Headwear seen on the cover of 'Guitar Hero III'
• Headpiece worn with tails
• Bit of formalwear
• Astaire/Rogers screwball comedy
• Tails accessory
• It goes with tails
• Astaire wear
• Work in that? Maybe if you're like Fred Astaire!
• PassГ© opera house garb
• Highest head-covering