There are many, many striped shirts in this world, but there is only one Saint James. As you know, J.Crew recently opened in Vancouver and I was thrilled when I saw that they carry Saint James. Hailing from Normandy, this sailor tee has been on the style map since 1850, or at least since Coco Chanel discovered it in the late 1910s. The long-sleeved version was worn by Audrey Tautou in Coco Before Chanel. (Other famous fans included Pablo Picasso and Andy Warhol.)
What I like about the Saint James version — other than the fact that it’s so incredible soft — is that it’s slightly baggy. Its sleeve width is quite generous, allowing one to do that nonchalant sleeve roll. 
$108 at J.Crew (in more colours!).