Pocketing fabric is a lightweight, plain-weave fabric that is used to line pockets and other openings in garments. It is usually made of cotton, polyester, or rayon and comes in a variety of colors and prints. Pocketing fabric is lightweight and breathable, making it an ideal choice for hot, humid climates. It also adds a finished look to garments, and can be used to line everything from the pockets of a shirt to the side seams of a skirt.