Fun experiment: Bend you arm all the way to your bicep, lick your palm and rub it in a circular motion where the forearm and bicep make a crease. You’ll notice quickly that your arm hairs ball up in a tangled mess to make little pills.
The pills on fabrics are the same thing. If the fabric has a lot of lose fibers/lint sticking off it they will eventually tangle together to make the pill.
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