For casual wear, especially with a tweed sport jacket, a shirt with a classic pattern is a must, especially if one doesn't plan on wearing a necktie.
|PHOTOS courtesy of T.M. Lewin.|
This slim-fit blue check shirt ($48; available here) comes with button cuffs, which makes it perfect for Americans, who, unlike their British cousins, tend to eschew French cuffs for everyday wear.
For a more refined look, go with the solid white shirt pictured above ($64; available here).
Though it doesn't have French cuffs, the curved cutaway collar elevates it beyond everyday wear. A full Windsor knot is always appropriate, but a slimmer necktie with a slightly twisted four-in-a-hand knot — think Sid Mashburn or Gianni Agnelli — would be quite dashing.