1) The word ‘stuff’ was used of a woollen fabric which was described late in its history as not having a pile (OED).
1653 some holland for my selfe and stuffe for her, Stockeld
1657 to John Fawcett my sonne one little trunck & my stufe suite, Thorpe Willoughy
1675 The persons who tooke the monies had their faces covered, one being mounted on a gray horse being in a close gray coate, th’other on a lusty bay gelding in a brone stuffe coate, Tadcaster. The occupational term occurs later: 1709 John Candler of Selby stuffe maker
1785 Samuel Clapham of Leeds, stuffmaker.