Prom and other formal dresses are typically worn once before spending an eternity hanging in your closet. Reduce your impact by shopping for a pre-worn dress. You’ll save money, energy and materials too. Ask around! Your neighbors’ Fall Formal gown might fit you perfectly, while an old dress worn by your mom, aunt or grandma will show off your cool style while guaranteeing no one shows up in the same look.

Photo by Angie Bakke.