You can buy jeans made from natural fibers like cotton, linen, or hemp. Not only that, recycling cotton fibers and using them to create jeans will reduce waste exponentially, and eco-friendly brands are involved in such sustainable practices. Rather than buying a new pair of jeans, you can also visit thrift shops where they store a large collection of second-hand clothes in good condition. You might find a perfect pair of denim at a low price.