Historical clue formulations

• Cuts open, as an envelope — 2026-07-06
• Narrow openings — 2025-12-11
• Vent openings — 2024-06-10
• Buttonholes, basically — 2022-09-04
• Pita pocket cuts, e.g. — 2022-05-11
• Uses a letter opener on — 2021-01-23
• Knives can make them — 2019-11-01
• Narrow cuts — 2018-09-23
• Narrow apertures — 2017-01-28
• Some vents — 2016-06-29
• Narrow openings — 2012-10-11
• Venting aids — 2012-06-08
• Squinter's eyes — 2010-08-26
• Skirt features — 2010-06-09
• Skirt features — 2008-05-22
• Narrow cuts — 2006-10-31
• Kangaroo pocket openings — 2006-10-05
• Narrow openings — 2006-09-04
• Snakes' eyes — 2004-06-04
• Vent features — 2000-10-30
• Narrow vents — 1998-10-21
• Small cuts — 1996-02-12
• Narrow openings — 1994-12-28
• Uses a knife — 1994-08-25