Crepe, also spelt crepe or crape, is a silk, wool, or synthetic fibre fabric with a distinctively crisp, crimped appearance, often used for blouses and dresses with graceful drape. Almost any fibre may be used, and the fabric can be thin and sheer, fine and opaque, or even heavy. Crepe (alt. crape) fabric may be stretchy, requiring care to cut and sew accurately. Its distinctive surface may be achieved by taking advantage of yarn twist, by arranging a suitable weave structure, by employing uneven warp tension, or by applying a chemical treatment.