(perimeter + 20 inches) multiplied by width of binding -> square inches needed
divided by
(36 inches by WOF) -> square inches in a yard
((96 +96 + 110 + 110 + 20) * 2.5) / (36 * 42)
(432 * 2.5) / 1512
1080 / 1512
0.714
The absolute minimum would be 3/4 of a yard (0.75 yard)
As jeemmerling621 said - this is for binding cut along the width-of-fabric, NOT bias and NOT straight-grain,
I would also go for at least a yard of fabric. If there is some sort of unique design or stripes or something, maybe a bit more.
Last edited by bearisgray; 05-20-2012 at 07:59 PM.