Historical clue formulations

• Item left at home on casual Fridays — 2021-10-26
• Bit of Blues Brothers attire — 2016-03-31
• Item not worn on casual Fridays — 2014-09-22
• Accessory for Annie Hall — 2013-02-20
• Unimaginative gift, maybe — 2013-01-24
• Upscale restaurant requirement, maybe — 2010-08-22
• Windsor, e.g. — 2008-04-20
• Often-stained piece of attire — 2007-03-26
• Windsor, e.g. — 2007-02-10
• Bit of business wear — 2006-04-05
• It has a knot — 2004-04-03
• Fashion accessory — 2002-06-30
• It may be looped — 2001-06-24
• Four-in-hand, for one — 2001-04-17
• Bit of business attire — 1997-07-27
• Absence at "dress-down days" — 1996-04-09