Tubular knit ribbing fabric by the yard. Hurrah! Knit ribbing is sometimes hard to find, so when we located this high-quality ribbing, we stocked up! This knit ribbing fabric is a great 50/50 cotton poly blend that means easy care and a super soft hand. Ribbing is used for cuffs, collars, waistbands, stuff like that. Ribbing fabric is tubular, so the width listed here is the actual width of the fabric, as if you have cut the rib knit in half and opened it out flat.