Historical clue formulations

• Strong fiber — 2016-12-23
• Flaxlike fiber — 2005-11-02
• Easily-wrinkled fabric — 2003-03-30
• Summer fabric — 1999-04-03
• Strong fiber — 1998-01-02
• Cottonlike fiber — 1997-06-24
• Lustrous fiber — 1995-10-21