What makes a fabric form those annoying "pills"?

About 10-15 yers ago, I bought a pair of Champion sweat pants from
someplace like KMart. They were terrible. Almost immediately, they
started forming those little "pills" that look like tiny balls of lint
all over.

I guess I am a slow learner. A couple of weeks ago, I bought another
pair of Champion sweat pants. This time it was online. They are
already doing the same thing. They are constantly covered with little
pills. Drives me crazy.

What causes some fabrics to pill up? Or, more importantly, what should
I look for in a cotton fabric that will not do this. Clearly, Champion
products are inferior and I will stay away from them, but what do I
look for?

Thanks

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