Le Jacquard Français napkins and placemats are woven in Gérardmer, France, in the same designs as the tablecloths and runners, so a table can match or be mixed. Napkins are 50 or 58cm square and sold individually, so you can buy exactly the number you need.
Placemats come in woven cotton, or coated in acrylic so spills wipe straight off: the Promenade Impériale and round Wagara placemats are the coated ones, made for everyday use.