"It's the finest investment in the world," says Washington Society Matron Margot Hahn. "You can't do anything in Washington without oneit's my dearest possession."
What she possesses is a fall, a gorgeous mane of human hair that pins to the top of the head to produce an extravagant but natural-looking cascade of tresses. From the Potomac to the Pacific, the fall is the runaway hair fashion of the season.
Neither as hot nor as heavy as a wig, which covers the entire head like a bathing cap, the fall has one great virtue: versatility. It can be worn long and straight, it can...