What is the deal?

Why is it when cashmere is blended with cotton that it comes off in furry clumps and gets all over everything?

I bought a sweater at Club Monaco last year that did that, it's dark pink - hot pink clumps look FAB all over my jeans.

Then I bought this one. Tried it on at home for 2 seconds with a white tank under it, and the tank got navy clumps all over it. Like I'd been rolling around with a navy puppy or something. I love the deep V, but it's going back.