Missoni coat

Photo: Chris Craymer

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Horse of a Different Color

This unlined wool topper has the classic cut of a trench—but feels more like a plush blanket, sweeping all the way down to the ankles. Its dusty blue plaid pattern kicks up the visual interest: "It not only polishes a look," says O creative director Adam Glassman, "it is the look," transforming a neutral-tone blouse and crepe trousers underneath.

Coat, Missoni, $5,700; 212-517-9339. Blouse, Reiss, $170; ReissOnline.com. Pants, Sportmax, $595; 212-674-1817. Sweater, Brochu Walker, $445; Katia Boutique, Houston; 713-621-1817. Hat, Gucci, $495; Gucci.com. Ring, Avant Garde, $88; 323-655-5592.