Knotted Trim from Birka - book "Cloth and Clothing in Medieval Europe" showed a section of a man's coat from Birka (Norse, approx. 1000 A.D.) with an intricate interlace trim. On close examination, I discovered that the trim was composed of silver spiral wire arranged in decorative knots in a cross pattern. (fig. 1). The resulting trim was stitched to a strip of silk and then to the garment fabric, which allowed the trim to be removed from the garment and reused with little difficulty.