Abstract: A covering for a lamp shade diffuser is disclosed. A conformable covering is prepared from a rectangular swatch of cloth. The top and bottom side edges of the swatch are hemmed to provide casing pockets which extend along the length of the swatch. A draw string is received in the upper casing pocket, and an elastic band is received in the lower casing pocket. The hemmed portion forming the lower casing pocket is gathered and stitched so that the relaxed length of the elastic band substantially exceeds the stitched length of the gathered hem. The ends of the rectangular swatch of cloth are sewn together to produce a tubular covering. The draw string is tensioned until the top of the covering is slightly smaller in diameter than the top of the lamp shade. The lamp shade is inserted into the tubular covering and the elasticized hem is positioned around and under the lower edge of the shade, thereby defining an underlap.