This is a Paul Smith shirt. Of course, it is authentic. The color is white, and the material is 100% cotton. The size is S. Flat measurements are: length/approx. 75cm, width/approx. 47cm, shoulder width/approx. 41cm, sleeve length/approx. 65cm. It has been used, but it can still be worn. This is a highly recommended item for those who fit the size. Notes Due to work, email replies may be delayed. Thank you for your understanding. There are stains in various places, such as the collar. Please understand that there may be minor scratches or stains that may occur during storage. Comments Please feel free to contact us if you have any questions.