Historical clue formulations

• Type of sandal — 2022-06-28
• Summer shoe style — 2021-10-24
• Kind of shoe that shouldn't be worn in a factory — 2020-07-25
• Shoe style — 2019-03-16
• Like Birkenstocks — 2018-03-08
• Like some women's shoes — 2014-04-22
• Showing some polish? — 2011-07-29
• Like some shoes — 2006-11-30
• Like some pumps — 2006-09-29
• Pump feature, possibly — 2005-01-27
• Like some mules — 2004-08-06
• Sandal feature — 2003-06-05
• Like some shoes — 2003-03-21
• Shoe style — 2003-03-13
• Sandal feature — 2002-03-19
• Kind of women's shoe — 1999-11-22
• Digital window? — 1999-05-02
• Shoe style — 1997-09-28
• Shoe style — 1996-03-03
• Women's shoe style — 1994-08-20