A tattersall poplin from Portugal in two of the planet's easiest-to-wear colors (three, actually) makes this an excellent four-season sport shirt. It's got a modified spread collar with lightweight, nonfused interlining for a soft, relaxed look. The cut is slim but never skinny, with a high armhole for mobility and a shirttail long enough to stay tucked in. (Sid likes it this way, but it's easy to shorten if you prefer.) It's made with single-needle stitching, 22 stitches/inch, flat-felled seams, and thick, 3.5mm Trocas shell buttons.