This is what I came up with. I do recommend using a "doll needle" it's monsterous. Like four inches monsterous. But the doll needle was perfect for upholstering the chair base.
Fabric (scraps, I don't actually know how much I used, less than two yards I would think)
a box (we used the box she came in)
ziplock bags- awesome for holding the stuffing in place
strong thread- for sewing fabric on
tape-for the box part and for telling the stuffing bags were they belong
hot glue, for attaching the final panels
thimble, you'll need it, your fingertips will thank you.
This is very "eye balled" and I did have to make some adjustments in the end, I hadn't accounted for cushion size when I measured height.
Step one. Remove girl from box.
Measure and cut box, save middle piece to cover front gap in chair
stack and tape two halves
I added poly fill to bags to desired fullness.
Cover bags starting with the arms, moving to the back.
I used household staples to hold fabric in place but they fell out. A lot. So I left the ones in place sewed on the back and side at AN ANGLE so that the bottom cushion would cover the stitches. Then I removed the staples.
Trimmed off the fabric in the back. I sewed on the front of the arms of the chair, adding additional stuffing as I went. I did use my sew machine to make the bottom cushion but this can definately be hand sewn.
Then I was ready to gule the final touches. The front was first. I covered the front lip where the cushion meets the chair, sewed the back edge of the cushion to the chair. Next I hot glued the side panels on wrapping them around the back a bit, then covered those bits with the final back panel.
Add a throw pillow
Maybe a lamp...
And a beautiful throw blanket... and viola! Beautiful sitting area.