As the textile, apparel, fashion, and retail industries move to become more sustainable, an area of interest is the use of recycled fiber, yarn, fabric, and product content in the development and production of new products. The decision to use recycled materials in products must occur during design and product development and continue throughout the manufacturing processes. There are several recognized stages in recycling collection, processing, and then use in a new product. Recycled materials used in textile and apparel products can be obtained throughout the textile and apparel supply chain and post-consumer collection methods. The use of recycled raw materials aligns with the larger movements of global industries toward a circular economy (vs. linear) and working to achieve a closed-loop production cycle. This chapter reviews the textile and apparel industry, factors that have influenced the generation and use of waste and recycling processes currently used today. Selected brands that have programs and products that contain recycled content are identified here.