Years ago we bought a couple of metal folding chairs.  They have come in super handy in many different ways, depending on the needs of our apartment a the time.

In this apartment, I often set up a "sunny photoshoot mini studio" by the windows using a TV tray and a folding chair.  The chair I use has been well loved, so the seat had a little tear that just kept growing.  I dug out some of my favorite heavy duty fabric from the hoard and got ready to revamp these workhorses.

First, I unscrewed the seat.  It's just a piece of particle board with a little foam and vinyl stapled over it.

Then I folded my fabric over the edges of the seat.  I put the white selvage edge at the back of the seat so I could put it back on the right way without a lot of buffoonery.

I was prepared to sew the fabric to the vinyl, but when I did a quick test by pinning the fabric to the chairs, I realized that was all that was needed to secure the covers.  OMG so easy!

See?  I pinned through the fabric and the vinyl of the seat cover on the back side of the seat.

At the corners I tried to keep things neat.  I used as many pins as it took to keep things looking good on the top side.

Progressive elaboration ... a.k.a. I figured out how to do better corners as I went. ;)

When I screwed the seat back on, I made sure the screws were super tight so they hold the fabric and pins in place.  I love the way the chairs look now, plus it's much more comfortable to sit on fabric than vinyl.  It will also be supercake to change them in the future.