Earlier forms of upholstery consisted of using all types of padding and materials that would have been readily available at the time (e.g. hide, straw and wool) - and stuffed into cushions and mattresses ("moveable" type). Practices eventually evolved to "fixed upholstery". In this case the upholstery was actually fixed to the wooden frames. Upholstery was still initially simple with the padding fixed tightly around frames. As time progressed though, deeper padding and more complex upholstery, consisting of multi-layers of hand-stitched stuffing, was applied in particular when augmented by coil-sprung foundations. This happened when the coil spring was introduced in the 1820s. More information on traditional upholstery can be found here.