I am making a prom dress that requires a deep v down to below the bust line and a low low back. The dress has princess seams with a halter style top. I believe that the v neckline will be gapping open, especially when the girl sits down. I have seen dresses with some kind of wire sewn into the seamline to support the V. I’d like to know if anyone has any suggestions on this. Is a wire OK? If so what guage do I use? Any other ideas?