First off comes the seats.
The chairs are reconditioned with Formby's Lemon Oil (love that stuff).
The seat are quite hard. Foam added to the seat will help ... to keep it in place I used painters blue tape.
Back side of seat.
She picked out upholstery fabric when Joann's had it at 50% off .... great deal.
I like to add regular cotton fabric underneath the upholstery to give it stability.
To hold it all together I use quilting basting spray, lightly.
Now that foam is a little hard so I got the idea of adding 2 layers of fleece. I scrounged around in my fleece scraps and zig zaged them together. That is know as "stashbusting".
Upholstery fabric is cut about 3" larger than the actual seat size. I did this so I'd have plenty of wrap around to accommodate the foam, 2 layers of fleece and 2 layers of cotton.
We decided to stable the cotton lining on first. This way we didn't have to worry about anything sliding or getting out of place.
Just a few stables all around to hold it in place.
I cut out the corners to reduce the bulk.