Are you measuring your quilt thru the center for your borders or along the edge? Measure thru the center
I do that, put a pin in if I am using a shorter tape measure and then add the two figures together to get the
right measurement. I have done borders on the diagonal and cut them the correct measurement. Sometimes
I don't want to do that and I purchase enough fabrice to cut them without piecing and then cut the correct measurement. This keeps your borders from waving. The only time I have pieced borders straight is
when I used a stripe and wanted it to match instead of having the 45 degree angle.