Thanks for the sizing advice. Does anyone remember if this shirt was available in sz. XS? Unfortunately, they already seem to be sold out of most sizes at Roden Gray. I'm not sure if this helps you but I got these measurements on the S/S button-down plaid shirt in sz. S: Pit-to-pit: 20'' Shoulder-to-shoulder: 16'' Total length: 28" On the medium it's ptp 20.75. Shoulder 16.50 length 28.75. Quite narrow in the shoulder is my take on the s/s plaid shirts.