Big Bird Costume Diy . I made his head out of a beanie hat and a feather boa. Make sure you cut out 4 samples of those fingers. Big Bird Costumes Costumes FC from www.costumesfc.com Then cut out a shape of bird’s feet (3 fingers) from the rest of your orange shirt. You will need to saw 2 of them together and fill them with the rest of shirt’s material or something of this sort, so the. And the big bird costume was born.