First off comes the seats.
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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.
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She picked out upholstery fabric when Joann's had it at 50% off .... great deal.
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I like to add regular cotton fabric underneath the upholstery to give it stability.
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To hold it all together I use quilting basting spray, lightly.
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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".
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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.
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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.
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Just a few stables all around to hold it in place.
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I cut out the corners to reduce the bulk.