I've had the fabric to make a slipcover for my sectional sofa for 5 years, but about the time I bought the fabric, I started making soap . It's finally happening! I've covered chairs before, but never something this size. I decided to try pinning with the right side out and seams trimmed to 3/4" (based on the good tuts from this generous blogger), with top-stitched seams rather than welting. Welting would probably look better, but it's more work and more prone to wear. Without thinking, I started with the most visible part of the sectional, so the pressure is on. Keep your fingers crossed for me!