Wear a brown sweat suit; one with a hooded sweatshirt wood be perfect! Cut out many leaf shapes from green felt and glue them on your sweat suit, primarily on the arms, shoulders, and hood.
You can also use red, orange, and yellow felt to make Autumn leaves for your costume. How about putting a small bird nest on your shoulder?
Looking for more costume ideas and Halloween projects? Check out these easy costume ideas! You can also browse through my other Halloween articles and find many Halloween crafts, games, recipes, and other activities.