I have never done a decorative stitch in a border but many of the ladies I know have. They sew binding on the back and bring to the front. Some try to line edge at front and back together, others don't seem to. They then sew the edge down using a decorative stitch from machine. I've not heard of any difficulties. I just prefer to hand stitch on the back and have just a seam at the front.
there was no thinner batting usually warm and natural.