Closet material can refer to a variety of materials used to line the interior of closets. Two common materials used for this purpose are LINEN and CEDAR. LINEN is a fabric made from fibers of the flax plant, and is often used to line closets due to its durability and breathability. CEDAR is a type of wood that is known for its pleasant aroma and insect-repelling properties, making it a popular choice for closet lining.