This particular shirt is made from a vintage deadstock fabric that was woven at the Highland Park Manufacturing Co. in Charlotte, North Carolina in the 1960s. The fabric content is a 65% polyester/35% cotton blend which was very common back in the day. I dig these types of fabrics because they are breathable like cotton, yet they stay crisp and do not fade even after many washes.
I don't currently have any of these shirts in the works. If you have you heart set on one, hit me up and I can most likely make it as a special order.