One yard will do it! :D :D
First are you just adding a normal binding? If so straight of grain is fine. Line up with the edge and cut 2 1/2" strips (with the long line of the fabric). Once have cut... Oh about 8 or 9 strips. Then you sew them together
draw a diagonal line and sew right on top of it as seen here:
[img]
http://1.bp.blogspot.com/_q_ISANhSeT...0/S5000453.jpg[/img]
Trim the corner off, allowing for seam allowance:
[img]
http://2.bp.blogspot.com/_q_ISANhSeT...0/S5000454.jpg[/img]
Press seam open, repeat until all strips are sewn on:
[img]
http://3.bp.blogspot.com/_q_ISANhSeT...0/S5000455.jpg[/img]
Then Iron in half long ways and viola binding!