We've covered alternatives to the cheap, plastic costumes that line the shelves this time of year. You know all about going vintage, handmade, and hand-me-down to reduce your Halloween waste.
..Energy Vampire: Remind your fellow partygoers about the waste of standby power from unused but plugged in appliances. A large box can easily be turned into a computer with fangs, or a suit and black bed-sheet cape can be decorated with large paper power outlets to show the terrifying danger of wasting energy.
Endangered Species: Spread the word about your favorite furry (or scaly, slimy, or feathered) friends who face extinction. A grey tracksuit with a paper-cone horn and ears becomes a message of solidarity for endangered rhinos, and animal costumes are cute on everyone. Search the endangered species list for your favorite animal, or search online for detailed DIYs, like this caribou costume tutorial from YouTube user BouTheCaribou.