The 4 Must-Have Pieces for Fall

The Tan Trench: Work

Svelte enough to be sexy, roomy enough to go over layers.

Secret agent mystique in a practical package—that's the beauty of this coat (London Fog, $100). Here it's paired with the season's "it" color: purple. "I love that deep, regal shade," says Denise Hungerford, 41, a marketer for an entertainment company. Her sleek ensemble: tweed suit (Talbots jacket, $219, and skirt, $119), shirt (DKNY Jeans, $79), and suede shoes (Ron Donovan). 

Earrings, Wendy Mink Jewelry. Ring, Wendy Brandes.