You can find fabric to cover the seat of a chair any where, not just at your favorite fabric store.
We live in Northern California and are lucky to have a Restoration Hardware Outlet within driving distance. I like to plan a trip there a few times a year. On my last trip I found these great Silver Sage and Tan pillows in their clearance section. They were $5 each, WOW!!! Unfortunately they only had two, and I needed at least 4 for my living room, what s a girl to do. I bought them knowing I would find them a home, at some point.
Well I finally found a home for my 2 pillows, as chair seat covers. I took a seam ripper to the seams which gave me four pieces of fabric which was just enough for my four chairs. I will say that Restoration Hardware makes good quality pillows, it took forever to get the stitches out of the pillows.
I took the 4 fabric squares and attached them to the seat by using my staple gun, it took a matter of minutes per chair. I love them, the fabric matches my dinning room perfectly and the fabric is very durable.
Not bad for a $10 re-cover.