I try to make long then trim back as needed, may not work if decorative. If measured then sewed w/border on the bottom without a walking foot, bottom may have lightly gathered as were sewn unless it was pinned, Can try to remove and re-add border with top on bottom and boarder on the top when sewing. also can gently hold bottom fabric firmer than top, may feed more even, Geeze hope that made since, you can do it!! :)