Have an Answer?
Simply, wearing them, making them, selling them, even designing them. Your looking at a multitude of majors from chemistry, business, dermatology, and more. I would research things such as how products are produced from start to finish and see what looks the most interesting. I warn you I don't think there is too much "Non-profit" sectors that are cosmetics based. The only one I could think of off the top of my head was based on self care of clients (grooming and hair.)