A lady came in and taught this to use a few months back at a long arm quilters meeting and I thought I would share. I am one of those people who do hand binding but when you are in a hurry and you need binding done fast..this is the way!
You will need two different colors for the binding strips
You cut the outer edge 1 3/8 you cut the flange peice 1 5/8 (inches)
Then sew them just like you would normal binding in one long strip ( short side ...to short side right sides together)
Then you sew them together to create your 2.5 inch binding
Sew them together on the long sides right sides together