Machine drying removes a tremendous amount of fibre from clothes, vs. line-drying. That's what dryer lint is. Both tumbling and temperature contribute to wear.

Clothes washing itself as well, though I believe to a lesser extent.

Sufficient vs. excessive laundering helps greatly.

https://www.sciencedaily.com/releases/1999/08/990831080157.h...

Cold or warm wash, don’t overagitate air dried helps a lot.