More Period Window Dressing Ideas
The Design Directory of Window Treatmentshas hundreds of treatments accompanied by illustrations by author Jackie Von Tobel. It will answer all your questions on workroom terminology such as the French pleat, bullion, Empire swag, tuxedo flap, jabot, pelmets, cornices and lambrequins. Above is a lambrequin which is a stiffened window treatment with extended sides or legs.
A cornice is an architectural header treatment: a plain box, upholstered or embellished with soft treatments.
A Pelmet is a decorative, stiffened valance, which may be flat or have stiffened sections or fancy shapes. A pelmet is always stiffened and interlined to avoid sagging and rippling. Welting and borders are often used to accentuate the shape of the pelmet. A pelmet can be used in combination with jabots, cascades, tails, swags, or flags.
Not sure about the designer for this room. I believe it is Mario Buatta. The walls are upholstered in Old World Weavers velvet.