the floor (to be the hem) and run it up the front edge and across the seat portion into the back crease. give a couple of inches on each end for seam allowance.
pin it all the way across the back crease (you know, where all the stuff gets lost). sew that seam all the way across, using your pins to mark where the corners meet the arms on each end, starting and stopping there.
now let’s move to the arms: cut a piece that wraps around from the seat to the crease of where the arm curves in on the frame on the outside of the arm.
then cut another piece that 