I am having an issue with my bodice back . When I put in the zipper, there is a gap at the top. It sits out about four centimeters.It seems to big to just move the zipper. It wouldn’t be straight. Do I need to pin the bulk like a dart? Then cut out another back (using the original one as a pattern). I’d have to redraw the neck line too? Would this work? Feeling a bit nervous. I would appreciate any comments .