Crape/Crepe is a silk, wool, or synthetic fiber fabric with a distinctively crisp, crimped appearance. The term crape typically refers to a form of the fabric associated specifically with mourning and was kept for years. Here is how old crape was made to look new again from an 1890s book.
Woman’s mourning bonnet in hard crape, c.1880 (Wikipedia)
How To Renew Old Crape
Place a little water in a tea-kettle, and let it boil until there is plenty of steam from the spout; then, holding the crape in both hands, pass it to and fro several times through the steam, and it will be clean and look nearly equal to new.