Instead of throwing out old clothes, use them to make a scarecrow. Take a shirt and pair of pants and stuff them with newspaper or plastic bags. Use a broomstick pushed into the ground to support him. For the head, glue spare buttons onto a brown paper bag to make eyes, a mouth, and ears and tie the bag onto the body. Top off your scary creation with an old hat.
For more DIY decor ideas, see Healthy Halloween Decorations