We have been using some Sure Fit furniture covers that were way too big for this delicate furniture, and I finally made some customs covers. I used Tonga Batik in 108" wide and clingy brown flannel on the back. Here are a few photos of the finished couch cover. I am still working on the chair cover.
Basically this is a large rectangle, with smaller rectangles attached to the sides for arm pieces. I free motion quilted each piece with large stippling, fitted them, then trimmed and bound them. I used a few upholstery pins to secure them in place.