FREE PEOPLE Women’s Willow Peach and Gray Wool and Alpaca Fair-isle knit poncho sweater Button detail cowl/mock neck Size XS Pilling is not a fabric defect and may be present on pre-loved items. Pilling happens naturally when fiber in the material become loose and friction caused by movement on the fibers causes them to ball up. This is a normal, common and easily treatable. All fabrics will pill at least a little bit over their lifetime.