cheat-seat cushions: top square and individual side panels, that are an extra 4 inches tall so they can wrap under the cushion (hem at a 45-degree angle to eliminate bulk). Add a casing and cord to tie.
I'm feeling like a dang darn genius!! I used a pretty fabric shower curtain (cuz its cheap) to make cute slip covers for the cushions for the love seat that I am refurbishing. Instead of zippers I used the whole that you would put the shower curtain ring through and made ties to string through them to hold the covers on the cushions nice and snug!! I'm awesome!!!!!