I started slip-covering the couch in May, and am getting closer! The cushions were gross & squished, so I'm redoing the cushions. I'm sewing a white cover onto the foam, and will then put on a "pillowcase" cover that I can wash. That way the foam stays protected. Overkill, maybe, but seriously, those old cushions were gross.
Bleached muslin (Kona, 90", I bought a bolt when I had a 50% off coupon...this used about 1.5 yards, so $4.50), batting (bought today with a 50% off coupon, $10), foam (bought in June with a 50% off coupon, $40)
pinning it all together, wrapped the corners like a present
hand stitching. Sloppy, but this is an underlayer
Also, I am not getting involved with piping!