Few things are as classic as a Breton stripe tee. A few iconic images come to mind: first being the gamine Jean Seberg in À Bout de Souffle (check out my Screen Style post), getting flirty with Jean Paul Belmondo; the second being the young Coco Chanel, with her wide-leg trousers, looking very cute and boyish; and the third being the sexy Brigitte Bardot reclined on top of a red car, in matching red pants and red Repetto slippers, in Et Dieu Créa la Femme. 
This pima cotton one by StyleMint is as classic as it gets, with its scoop neck, 3/4 length sleeves, and striped with a bright royal blue. 
$29.99 at StyleMint (now shipping to Canada).