How to mitre an edge that is being whipped
By Brenda Ticehurst _
Step 1 : The edge should be machine stitched close to the edge on all sides with a zigzag stitch. Then draw a diagonal line with a pencil from one corner to the other.
Step 2 : Whip up to the line coming down from the other side .
Step 3 : Start to follow the pencil diagonal line, then make three stitches at the bottom and start the other half and going up to the diagonal in the new direction.
Step 4 : When even, continue to whip as usual.