Great, thanks for the link. So the band is knit along with the front piece, lets see.... the only way I think you can do this without reknitting it, is to sew the larger hole so it makes 2 smaller ones, but that won't give you a nice neat edge. So I think you may need to reknit the Left front, rip back to the row with the first buttonhole and go from there.
Ripping back is part of knitting, you just get to knit longer is all...
sue- knitting heretic