Easy Diy Superhero Costume . Next cut an oval in the centre 6″ x 4″. No sew superhero costume tutorial by twindragonflydesign; Homemade Superhero Costumes Delightful DIY Capes for Kids from wonderfuldiy.com No sewing diy superhero cape. Become a homemade vigilante diyready.com | easy diy crafts, fun projects, & diy craft ideas for kids & adults october 14, 2015 at 12:01am […] image via liagriffith […] reply. Be sure to try it on and make sure that it fits over the head of the child.