Deer Costume Diy . It’s perfect for any age because the base of the costume is everyday. This look was super quick. Deer Costume Deer halloween costumes, Family halloween costumes diy from www.pinterest.ca Includes b&w mask template sheets to color in, plus animal activity fact worksheets. The first step of how to make a deer tail for costume is to make the base for the cotton balls to stick. Trace the design for the deer stomach, making sure you go to the bottom of the leotard.