Sep 24, · As a basis for many homemade Halloween costumes for adults can, of course, be used conventional clothing. For example, a T-shirt in the right color, a pair of pants or leggings that are tailored to your concept. Mummy and ghost costumes . Oct 10, - Explore Haven Walters's board "homemade halloween costumes for adults", followed by people on Pinterest. See more ideas about halloween costumes, costumes, homemade halloween costumes pins.