How to keep knitwear looking new
Knitwear does not wear out so much as it gets mishandled. Wash cold and by hand where you can; a machine on a wool cycle is fine if the label says so.
Never hang a knit. The shoulders stretch and they do not come back. Fold it, and give it a day to rest between wears so the fibres recover.
Pilling is normal, not damage. A comb takes it off in a minute.