Sonic the Hedgehog and Tails DIY Halloween costumes for kids. -Start with hooded sweatshirts and sweatpants -Using matching fleece material, sew on spikes, ears, and tails. Fill spikes, tails, and ears with cotton -Use additional fleece material to sew on embellishments such as inner ears, Sonic's arms, stomachs, whiskers, tail tips, and Tails' fur on hood. Fill whiskers and Tails' fur on hood with cotton -Shoes are shoe covers made of felt and elastic -Add regular socks and white gloves