Cleaning out my closet of some slim-fit shirts. These should fit anyone in a typical M or 38R quite well.
Uniqlo orange linen, M
This is a thicker linen so it works multi-season (orange is good for fall but it's also bright enough for spring/summer). Back darting. Single pocket.
Banana Republic, indigo cotton, L (16-16.5)
Nice, dark indigo navy. Back darting. Single pocket with flap and pocket.