27. The Striped T-Shirt — Like the Swiss Army knife of your wardrobe, your striped T-shirt is nothing short of a daily savior. Rainy day, sweltering hot day, party after-work day…it's up for anything. And somehow, the right striped T-shirt just makes you feel like you have your act together (even when you don't).

Burberry Striped Tunic, $450, available at Burberry; Uniqlo Boat Neck Striped Tee, $19.90, available at Uniqlo.