Place the sweatshirt on a flat surface. Pull a section of the fabric tight and lightly run the fabric comb over areas with pilling. Remove fabric from the comb teeth as needed. Repeat until all pilling is removed.
Lay the sweatshirt on a rounded surface. Pull on a section with pilling and hold it taut. Cut the pilling from the sweatshirt with scissors. Repeat on each section of the sweatshirt until the pilling is gone.
Lay out the sweatshirt on a flat surface. Hold a section of the sweater taut and gently rub a fabric pumice stone over the pilling. Repeat on all areas with pilling.