The cloth used for covering a seat and/or the substance used for filling it. (Cambridge Dictionary)
Materials (such as fabric, padding, and springs) used to make a soft covering especially for a seat. (Merriam – Webster)
Soft, padded textile covering that is fixed to furniture such as armchairs and sofas. (Oxford Dictionaries)
Example
Upholstery – Wikipedia.

https://en.wikipedia.org/wiki/Upholstery
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