This great Victorian crazy quilt was brought to me as a top. I replaced one missing corner area with a brown silk, covered several worn pieces with crepeline to protect the fraying fabrics, backed it with a black cotton, and bound the edges with a brown silk.
Here is a square with several crepeline-covered pieces - the white piece on the left, the two central light pieces, and the one on the lower right, where the broken silk is very easy to see. From this photo, you can get an idea of how nearly invisible the fine crepeline silk is.