Marvin The Martian Costume Diy . Coolest homemade marvin the martian costume. I spent a lot of time conceptualizing this homemade marvin the martian costume and worked on it a few hours here and there over the course of 3 weeks. DIY Kids "Marvin the Martian" Costume 5 Steps (with Pictures) from www.instructables.com I fully intended to make a costume with normal mobility and field of vision this year. I got a wild hair one day and decided that for my kids homemade costume ideas, marvin the martian was a cool character that i felt would be a fun project to duplicate. Check out our marvin the martian cosplay selection for the very best in unique or custom, handmade pieces from our shops.