J. Jill Red Plaid Tunic Button Up Shirt. It is a long-sleeved tunic-style shirt with a red and black plaid pattern. The garment has a button-down front, a collar, and a curved hem. The material is often described as being soft, with some sources mentioning cotton or a cotton blend, flannel, or rayon. The shirt in the image is a size small with approximate measurements of 21 inches from pit to pit and a length of 30 inches from the shoulder to the front hem. Jjill is blacked out on size tag, but still visible!