Diy Transformer Costume Template Optimus Prime . What you will need to make your transformer costume. All hako clones are glue together papercr. Transforming Optimus Prime Car Costume Template for Kids & Etsy from www.etsy.com Cut the oatmeal container into 6 circles. Diy halloween costumes are so much more fun. Make an optimus prime robot costume that can transform into a truck.