The latest waist-friendly look is the unabashedly ladylike peplum top. Sienna Miller wore a 1940s-inspired Vidler & Nixon coat on the streets of London. "[We] used cinched waistlines and a strong cut to accentuate the body's curves," says designer Kerry Nixon. Meanwhile, an Avion Feminin dress showed off Diane Kruger's figure to perfection. "Diane Kruger wore the dress in a really modern, elegant way," says the line's designer, Katherine Tsina. "With strong accessories and feminine heels."

—Betony Toht