If it's only out a 1/4 inch, I would put the longer side to the feed dogs and put the shorter piece on top and try sewing it together. A little bit out on the seam lines shouldn't be too noticeable and the feed dogs help ease in extra fabric. Or you can just trim the 1/4 inch off on the one side that is long. It won't be perfect but chances are you'll be the only one to notice it. It looks awesome!