This is not the original upholstery. They had been professionally redone long ago in this cotton fabric and then were abused like you wouldn’t believe. This some of the dirtiest upholstery I’ve ever seen!
Fortunately it is possible to remove all of the old stuff down to the frame and replace it with clean new materials. This is Knoll’s Classic Boucle, a wool/nylon blend that looks and feels lovely. This is a dark brown that they call “Pumpernickel”.
Not only was the fabric dirty, but the teak was actually crusted with food in places, plus the usual paint scuffs—and whoever reupholstered them had also added a coat of lacquer to the wood, probably because it was dried out and someone thought it needed some gloss.
There’s nothing wrong with lacquer per se, but it was worn and peeling and kept my teak oil from being absorbed evenly.
Teak really only needs oil.