from The Century Dictionary.
- noun A heavy silk, especially black or of plain color, usually corded.
Sorry, no etymologies found.
Moreover, it was as picturesque within as it was arcadian without; for the fine alert-looking men, with their powdered hair in queues, their elaborately cut clothes of many colours, made for the most part of the corded silk named ducape, their lawn and ruffles, made up the details of a charming picture, which was far from appealing to them, but which gives us a distinct pleasure in the retrospect.
"The young fop," fumed Clinton, as he brushed a fleck of mud from his own magnificent costume of black ducape, "he is the _enfant gâté_ of politics, and I shall settle him here once for all.