I buy 3 yards usually. Reason - I have an unfinished quilt that I cannot find the same piece I started with. When I was new to quilting, everyone told me not to choose a border fabric until the center of the top was done. When the center was finished, my DD decided she wanted one of the fabrics in the pattern for the border - and it is not available any longer. :cry:
So, live and learn.
My DH thinks 3 yards is a minimum cut. :lol: I'm not telling!