ELI5 Cotton - why cotton shirts feel stiffer when hung to dry?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

Why are clothes that are hung to dry crunchy/stiffer than clothes dried in a dryer? How does spandex make cotton stretchy? What does it mean when they say cotton 50% and something else 50% like polyester or lycra? Please explain bed sheets and thread counts?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: ldi1, prionbacon, dbmaniac, shoziku, aktuarie, motomike256, dansworth, quantumhamster, demanbmore, kstakka, platanosinpantalon, jarjarawakens and pescodar189.

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