Here's a great looking lightweight shirt from Carhartt. It's a 5.5-ounce 100% cotton work wash twill with two chest pockets, one with button-down flap. If offers a box pleat back yoke for better range of motion and double-stitched seams. One of the best features is that Carhartt pre-washes this shirt, so it is soft and ready to wear right out of the box!