The Costume Making Guide Time will teach you things like how to incorporate Worbla and EVA foam into your cosplay.
Learn from an expert and make expert costumes. Perfect for cosplay or Halloween. Svetlana Quindt, aka Kamui Cosplay will teach you all of the secrets you need. She has created things like a Fallout 4 Dweller, Xena, even a Diablo wizard. It will walk you through step-by-step with both description and photos, while using some of the more intimidating materials.
Only $22.99 from ThinkGeek.com. Shop for costumes and save money on Rout.com.