A Rich Fill Shirting Uniform Fabric is a broad term used to refer to a variety of fabrics, where the fabric is generally tightly woven and less sheer, making them an ideal shirt weight. Shirting fabric tends to have a high thread count and is usually yarn dyed, ensuring that the pattern is woven into the fabric. It is a heavy, rich fabric made on jacquard looms to give it texture, woven with extra threads in multiple colors.