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Compare this to close up below (best I could do :() of the cabled sweater I knit from a worsted weight 3- or 4-plied yarn (llama or alpaca) some 15 years ago. It pills.
Usually shorter and/or weaker fibers of will protrude above the fabric. When subject to friction (e.g., rubbing), these fibers catch and create little clumps of fibers called “pills.”
Variables: How much your fabric pills generally depends on a combination of variables, including: type of fiber (soft yarns pill more)…
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