NWT Everlane The Organic Cotton Muscle Tee in black. Size Extra Small. The Organic Cotton Muscle Tee features a delicate rib-trim crewneck, double layer cap sleeves and exaggerated shoulders. Its relaxed, boxy fit is perfect for working out (or not, we won’t tell). Our favorite part? It’s made from certified organic cotton. This tee has a boxy fit with longer armholes, we recommend sizing down for a slimmer fit. Pit to pit measures 19” Length 24”