A fantastic plaid poplin from Italy makes for a sport shirt that’s both lively and very wearable. This one'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.