This slip cover was created because I needed to make the black chairs in my kitchen lighter for photographs. We didn't end up using them, but it was so easy to do, I'm going to make two more for the chairs I didn't cover. Here's what I did:

Measuring and cutting:

1. Measure chair back across and to the seat.

 

2. To cut I added 1/2" to the measurement going across and 3/4" to the measurement going down.

3. Cut two layers of fabric on the fold in your new measurements. The fold is the top of the chair, so you are cutting the long way.

4. For a ruffle, cut a piece of fabric double the width of the chair x 4 1/2".

Make Ruffle:

1. Fold the ruffle fabric in half the long way right sides facing. 

2. Sew a 1/4" seam on each short end of the ruffle.

 3. Press, trim and turn so the right side is out.

4. Press

 If you have a ruffler for your machine, by all means, use it. I did. But if not do the following:

5. Using an 1/8" seam allowance sew a basting stitch across the right side of the ruffle. Pull thread to gather.

Hint: I like sewing from the middle to each end.. That way I have less of a chance of breaking the thread when I pull it over the two shorter distances. Another good idea is to sew two lines of stitches to give you a fuller gather. Always press your ruffle after you have gathered to hold it in place. 

Attach the ruffle to the back side of the slip cover:

1. Fold the short ends of the slip cover in 1/4" toward the wrong side of the fabric and press in place.

2. Pin the ruffle in place 1/4" from each end of the right side of of one of the ends of the slip cover with the raw edges of the ruffle along the fold you just created.

 
 3. Using a 1/4" seam allowance, sew the ruffle in place.

Create the slip cover:

1. Fold the piece together right sides facing and sew each long edge using a 1/4" seam allowance (pin the ends of the ruffle inward so they don't get in the way).

2. Press stitching, trim corners and turn and press again. The ruffle is now facing down and the folded edge you sewed on is folded under.

Hem:

1. When you pressed the ruffle down, the hem of the ruffle side naturally turned up toward the wrong side of the fabric. Now turn the other side up 1/4" toward the wrong side to match and press in place.

2. Turn the piece inside out, and edge stitch along the inside edge of the folded hem using a 1/8" seam allowance.

Finishing touch:

1. You'll notice at the top of the slip cover that the top corners are rather pointy. To make them more of a box shape, fold each pointed end down 1/4" onto the side of the slipcover and hand stitch in place.