Historically, the market for decorative trims, or passementerie, dropped off as the Victorian era, with its opulent taste, drew to a close. But their popularity has since returned, and even the most severely edited interior is likely to have beautifully executed trims. Trims in contrasting colors can help "draw attention to perimeters," says Washington, D.C., designer Mary Drysdale. "They accentuate the design elements of a room."

Trims were originally used to decorate wall hangings, equestrian gear, or clothing, but the introduction of upholstery in the 17th century presented a new use: to cover nail heads and uneven seams. They were ideal for camouflaging mistakes, which were surprisingly numerous as upholsterers gradually mastered their new craft. Today, trims are found not only in the seams of seating, but also on window treatments, tablecloths, bedding, lampshades, and even area rugs.

Although select design firms still produce handmade silk trim, employing many of the same methods used in the 18th century, their wares no longer cost more than the furniture they embellish. But whether they are silk or synthetic, trims always connote luxury -- the string of pearls when a rope of beads would do. "Trims are usually not a necessity, but they add a layer of interest that gives depth to a room," explains decorator Betsy Barmat Stires of Great Falls, Virginia. In one project, Stires used an exquisite chandelier with natural turquoise stones and accented the sofa cushions with bright turquoise fringe.