Historical clue formulations

• Stamp purchase — 2026-06-19
• Word before metal or music — 2025-09-08
• Unit of stamps — 2024-02-11
• Part of a homemade Halloween costume — 2022-09-18
• Small paper unit — 2022-08-30
• What's often kept undercover? — 2022-04-27
• With 27-Across, slippery hazard — 2020-06-17
• Unit of stamps — 2020-06-07
• Ream unit — 2020-01-07
• Sleep on it — 2020-01-04
• One of 500 in a ream — 2018-12-10
• Mattress cover — 2018-08-20
• Makeshift ghost costume — 2018-01-28
• Large, shallow pan — 2017-07-14
• Unit of rain or ice — 2017-02-11
• Crude Halloween costume — 2016-03-25
• Makeshift ghost costume — 2016-02-23
• Purchase for a king or queen — 2015-08-24
• Word before cake or music — 2014-09-17
• Form of many a birthday cake — 2013-12-21
• Undercover item? — 2013-07-19
• Pillowcase go-with — 2013-01-15
• Ream unit — 2013-01-09
• Word with cookie or rap — 2012-01-04
• 0.2% of a ream — 2011-01-16
• Pillowcase accompanier — 2010-03-22
• Thing fit for a king — 2008-11-14
• Cover of night? — 2008-08-26
• Impromptu Halloween costume — 2008-05-04
• Retiree's coverage? — 2007-09-28
• Quickie ghost costume — 2006-11-14
• Part of many a Halloween costume — 2006-04-15
• Ghost costume, basically — 2005-08-08
• Bedding item — 2004-03-17
• Piece of music — 2004-02-08
• Quire member — 2003-01-30
• Sleep on it — 2003-01-03
• Night cover — 1998-03-08
• Basic Halloween costume — 1997-07-06
• Kind of music or lightning — 1997-02-15
• Linen item — 1996-02-27
• Halloween garb — 1996-01-31
• Coating — 1994-02-13
• Ghost costume? — 1993-12-26