Here's a chair you can make on your own:

And that's what it was:

So, let's start!

Take your old chair. Remove the seat and backrest.

Sandpaper wih the softest piece.

Wipe with a damp cloth.

Take any acrylic varnish for wood, add white paint, and apply 2-3 layers with breaks for drying for 1 hour.

Meanwhile make the upholstery: replace the stuffing with something fresher (polyester, batting).

Take measurements of the seat and backrest and to cut new ones out from any suitable material, for example, I took crocheted pattern.

Further, nail the fabric — first to the corners, slightly pulling, then every 1-2 cm.

Backrest is stitched inside along the sides.

The last side is sewn with a concealed stitch.

Fasten the details to the chair as they were. Done!