The most fundamental way to add body and fullness to drapery is using an interlining, a fabric that hangs between the lining and face fabric. Greenhouse offers a variety of fabrics to use for interlinings, including; interlining, heavy flannel and bump cloth. These interlinings vary by weight with bump cloth being the heaviest and are available in natural or white. Using an interlining is essential when working with a silk or a light weight fabric unless it is sheer. Not only does interlining add body and fullness but it also serves as insulation as well as protection from sun damage.