What term describes a form of casket interior where the lining material is steamed and attached to backing?

The term that best describes a casket interior in which the lining material is steamed and attached to a backing is "crushed interior." This technique involves manipulating the fabric to create a textured and appealing appearance through the process of steaming, which helps to mold the material in a way that enhances its visual characteristics. The result is a luxurious and plush finish that can enhance the overall look of the casket.

Other terms refer to different methods of fabric treatment. For instance, the tufted interior involves creating button-like depressions in the fabric, giving it a distinct padded look. The stitched interior features seams that hold the lining in place through visible stitching, which may create patterns but does not involve steaming like the crushed technique. On the other hand, a swagged interior typically includes draped and gathered fabric, which also differs from the smooth, flattened presentation of a crushed interior. Thus, the definition and process associated with a crushed interior distinctly make it the correct choice for this question.