Tiered dresses in luxe fabrics and whimsical layers skirt the line between sweet and saucy, making them perfect for a romantic night out on the town. Andrew Gn's empire-waisted vermillion silk tiered gown features a plunging neckline of handcrafted ruffles; it's finished with a silky side bow and a waterfall of flowing fabric ($7,950; bergdorfgoodman.com). Valentino has welcomed the season of love with a flirty one-shoulder sky-blue gown made from layers of gravity-defying taffeta ($23,850; valentino.com). Luella's form-fitting ruffle minidress, in midnight-blue organza, demands to be admired over a candlelit dinner ($670; luella.com). Notte by Marchesa mixes foxy with romantic in a stunning black metallic lace baby-doll dress with a scalloped, tiered skirt ($735; www.net-a-porter.com). For a more modern love affair, Chanel's art deco-inspired silver and white sequined minidress blends structure with a touch of sweetness, adding 18-karat-gold accents and a shell-encrusted gold vintage brooch (price upon request; chanel .com). On Feb. 14, a little layer goes a long way.